diff --git a/sound_algo/data_only/matrix.scd b/sound_algo/data_only/matrix.scd
index d6e4dea..20302d2 100644
--- a/sound_algo/data_only/matrix.scd
+++ b/sound_algo/data_only/matrix.scd
@@ -24,6 +24,12 @@
 ~matBeatsPerBar = ~matBeatsPerBar ? 4;
 ~matLastColor   = ~matLastColor   ? Array.fill(~matVoices.size, -1);
 
+// -- Persistence env init (nil-guarded) --
+~matDir        = ~matDir        ? "~/.config/av-live/matrices".standardizePath;
+~matPresetDir  = ~matPresetDir  ? (PathName(thisProcess.nowExecutingPath).pathOnly ++ "matrix_presets");
+~matSavedNames = ~matSavedNames ? Set.new;
+File.exists(~matDir).not.if({ ("mkdir -p " ++ ~matDir.quote).systemCmd });
+
 // -- ~matBaseFor : capture base Pdef source once (lazy, per voice name symbol) --
 // Returns nil when the Pdef is missing (safe for partial environments).
 ~matBaseFor = { |name|
@@ -160,6 +166,112 @@
     ~matPush.()
 };
 
+// -- ~matSafeName : sanitize a name to a safe filename (alphanumeric, -, _, space→_) --
+~matSafeName = { |name|
+    var s = name.asString.select({ |c| c.isAlphaNum or: { "-_ ".includes(c) } }).replace(" ", "_");
+    (s.size > 0).if({ s }, { "untitled" })
+};
+
+// -- ~matGridValid : confirm a grid is 16 x matBars with integer cells 0..6 --
+~matGridValid = { |g|
+    g.isArray and: {
+        g.size == ~matVoices.size and: {
+            g.every({ |row|
+                row.isArray and: {
+                    row.size == ~matBars and: {
+                        row.every({ |v| v.isInteger and: { v >= 0 and: { v <= 6 } } })
+                    }
+                }
+            })
+        }
+    }
+};
+
+// -- ~matNames : list base names of .matrix files found in a directory --
+// User dir: served from in-memory ~matSavedNames (populated by ~matSave) —
+// avoids filesystem-scan quirks that can fail headless in some SC contexts.
+// Other dirs (e.g. shipped presets): scan via ls+tmpfile (systemCmd is
+// synchronous and works headless; pathMatch/Pipe.getLine are unreliable).
+~matNames = { |dir|
+    (dir == ~matDir).if({
+        ~matSavedNames.asArray
+    }, {
+        var ext = ".matrix";
+        var result = [];
+        File.exists(dir).if({
+            var tmp = "/tmp/_av_live_matnames_.txt";
+            ("ls -1 '" ++ dir ++ "' > '" ++ tmp ++ "' 2>/dev/null").systemCmd;
+            File.exists(tmp).if({
+                var content = File.use(tmp, "r", { |f| f.readAllString });
+                ("rm -f '" ++ tmp ++ "'").systemCmd;
+                content.split($\n).do({ |fn|
+                    (fn.size > ext.size and: {
+                        fn.copyRange(fn.size - ext.size, fn.size - 1) == ext
+                    }).if({
+                        result = result.add(fn.copyRange(0, fn.size - ext.size - 1).asSymbol)
+                    })
+                })
+            })
+        });
+        result
+    })
+};
+
+// -- ~matGridPush : send full 512-int grid row-major to surfaces --
+// index = vi * 32 + bar  (voice-major, flatten concatenates rows in order)
+~matGridPush = {
+    ~toscSend !? { ~toscSend.valueArray(["/matrix/grid"] ++ ~lp[\matrix].flatten) }
+};
+
+// -- ~matListPush : send all available preset + user-save names to surfaces --
+~matListPush = {
+    try {
+        var names = (~matNames.(~matPresetDir) ++ ~matNames.(~matDir)).as(Set).asArray.sort;
+        ~toscSend !? { ~toscSend.valueArray(["/matrix/list"] ++ names) }
+    } { |e|
+        ("[matrix] listPush err: " ++ e.class.name).postln
+    }
+};
+
+// -- ~matSave : persist current grid to ~/.config/av-live/matrices/<name>.matrix --
+~matSave = { |name|
+    var safe = ~matSafeName.(name);
+    var path = ~matDir +/+ (safe ++ ".matrix");
+    File.use(path, "w", { |f| f.write(~lp[\matrix].asCompileString) });
+    ~matSavedNames.add(safe.asSymbol);
+    ("[matrix] saved " ++ path).postln;
+    ~matListPush.();
+};
+
+// -- ~matLoadFile : load and validate a grid from an absolute path --
+~matLoadFile = { |path|
+    var g;
+    File.exists(path).if({
+        g = File.use(path, "r", { |f| f.readAllString }).interpret;
+        ~matGridValid.(g).if({
+            ~lp[\matrix] = g;
+            ~lp[\matPlaying].if({ ~matApplyBar.(~lp[\matBar]) });
+            ~matGridPush.();
+            ("[matrix] loaded " ++ path).postln;
+            true
+        }, {
+            ("[matrix] invalid grid in " ++ path).warn;
+            false
+        })
+    }, {
+        ("[matrix] not found " ++ path).warn;
+        false
+    })
+};
+
+// -- ~matLoad : load by name; user save wins over shipped preset --
+~matLoad = { |name|
+    var safe = ~matSafeName.(name);
+    var up   = ~matDir       +/+ (safe ++ ".matrix");
+    var pp   = ~matPresetDir +/+ (safe ++ ".matrix");
+    File.exists(up).if({ ~matLoadFile.(up) }, { ~matLoadFile.(pp) })
+};
+
 // -- OSCdefs (unique \mat_* keys; register sender for TouchOSC feedback) --
 OSCdef(\mat_cell, { |msg, time, addr|
     ~toscTouch !? { ~toscTouch.(addr) };
@@ -181,5 +293,20 @@ OSCdef(\mat_clear, { |msg, time, addr|
     ~matClear.()
 }, '/matrix/clear');
 
+OSCdef(\mat_save, { |msg, time, addr|
+    ~toscTouch !? { ~toscTouch.(addr) };
+    ~matSave.(msg[1].asString)
+}, '/matrix/save');
+
+OSCdef(\mat_load, { |msg, time, addr|
+    ~toscTouch !? { ~toscTouch.(addr) };
+    ~matLoad.(msg[1].asString)
+}, '/matrix/load');
+
+OSCdef(\mat_list, { |msg, time, addr|
+    ~toscTouch !? { ~toscTouch.(addr) };
+    ~matListPush.()
+}, '/matrix/list');
+
 "[matrix] ready".postln;
 )
diff --git a/sound_algo/data_only/matrix_presets/.gitkeep b/sound_algo/data_only/matrix_presets/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/sound_algo/data_only/matrix_presets/acid_line.matrix b/sound_algo/data_only/matrix_presets/acid_line.matrix
new file mode 100644
index 0000000..ea03ab2
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/acid_line.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/acid_storm.matrix b/sound_algo/data_only/matrix_presets/acid_storm.matrix
new file mode 100644
index 0000000..79fd8c8
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/acid_storm.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6]
+]
diff --git a/sound_algo/data_only/matrix_presets/detroit.matrix b/sound_algo/data_only/matrix_presets/detroit.matrix
new file mode 100644
index 0000000..1702747
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/detroit.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/dub_chords.matrix b/sound_algo/data_only/matrix_presets/dub_chords.matrix
new file mode 100644
index 0000000..f7f04f8
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/dub_chords.matrix
@@ -0,0 +1,18 @@
+[
+ [4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/dub_space.matrix b/sound_algo/data_only/matrix_presets/dub_space.matrix
new file mode 100644
index 0000000..c68afa0
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/dub_space.matrix
@@ -0,0 +1,18 @@
+[
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/generate_presets.py b/sound_algo/data_only/matrix_presets/generate_presets.py
new file mode 100644
index 0000000..04de3cf
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/generate_presets.py
@@ -0,0 +1,144 @@
+#!/usr/bin/env python3
+"""Generate matrix preset .matrix files for the AV-Live matrix arranger.
+
+Each preset is a 16-voice x 32-bar grid of colors 0-6, written as an SC-
+interpretable nested-array literal (read by ~matLoadFile in matrix.scd).
+
+These are NEW hand-authored arrangements *inspired by* the character of the 14
+data_only concert morceaux (the morceaux themselves use a different instrument
+set and have no bar structure, so they can't be transcribed -- see the matrix
+analysis). They are editable starting points: load one, tweak, save your own.
+
+Voice row order MUST match ~matVoices in matrix.scd:
+  kick hats clap perc sub acid arp lead stab pad ride rim tom reese bells sweep
+Colors: 0 off | 1 base | 2 double-time(denser) | 3 oct+ | 4 half-time(sparse)
+        5 oct- | 6 accent. (3/5 are ~base until launchpad reads \\octave.)
+Run:  python3 generate_presets.py   (writes *.matrix next to this script)
+"""
+import os
+
+VOICES = ["kick", "hats", "clap", "perc", "sub", "acid", "arp", "lead",
+          "stab", "pad", "ride", "rim", "tom", "reese", "bells", "sweep"]
+VI = {n: i for i, n in enumerate(VOICES)}
+BARS = 32
+HERE = os.path.dirname(os.path.abspath(__file__))
+
+
+def grid():
+    return [[0] * BARS for _ in range(len(VOICES))]
+
+
+def put(g, voice, a, b, color):
+    """Fill voice rows bars a..b inclusive with color (clamped to grid)."""
+    for bar in range(max(0, a), min(BARS - 1, b) + 1):
+        g[VI[voice]][bar] = color
+
+
+def build(segments):
+    g = grid()
+    for (voice, a, b, color) in segments:
+        put(g, voice, a, b, color)
+    return g
+
+
+# --- 14 arrangements (intro / build / main / breakdown / drop shape) ----------
+# Segment = (voice, startBar, endBar_inclusive, color)
+
+PRESETS = {
+    # 01 sparse hypnotic: half-time kick + sustained sub, minimal
+    "hypno_drift": [
+        ("kick", 0, 31, 4), ("sub", 0, 31, 1),
+        ("perc", 16, 31, 4), ("pad", 8, 31, 1),
+    ],
+    # 02 driving roll: quarter kick, 16th stab(perc), shaker hats
+    "hypno_roll": [
+        ("kick", 0, 31, 1), ("perc", 4, 31, 2), ("hats", 8, 31, 2),
+        ("sub", 8, 31, 1), ("stab", 16, 23, 1), ("perc", 24, 27, 4),
+    ],
+    # 03 acid line: kick + 16th acid + sub
+    "acid_line": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 1), ("acid", 4, 23, 2),
+        ("hats", 8, 31, 2), ("acid", 24, 27, 4), ("acid", 28, 31, 2),
+    ],
+    # 04 acid storm: denser acid, sweep accents on drops
+    "acid_storm": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 1), ("acid", 0, 31, 2),
+        ("hats", 8, 31, 2), ("clap", 16, 31, 1),
+        ("sweep", 15, 15, 6), ("sweep", 31, 31, 6), ("acid", 24, 27, 4),
+    ],
+    # 05 hard pump: kick + perc 8th + sub rumble
+    "hard_pump": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 2), ("perc", 4, 31, 2),
+        ("hats", 12, 31, 2), ("clap", 16, 31, 1), ("perc", 24, 27, 4),
+    ],
+    # 06 hard rave: break kick, stab hoover, sweep crash
+    "hard_rave": [
+        ("kick", 0, 31, 1), ("clap", 4, 31, 1), ("stab", 8, 23, 1),
+        ("hats", 8, 31, 2), ("sweep", 15, 15, 6), ("sweep", 23, 23, 6),
+        ("stab", 28, 31, 6),
+    ],
+    # 07 dub chords: very sparse, half kick + sub + pad chord stabs
+    "dub_chords": [
+        ("kick", 0, 31, 4), ("sub", 0, 31, 1), ("pad", 0, 31, 1),
+        ("stab", 8, 31, 4), ("perc", 16, 31, 4),
+    ],
+    # 08 dub space: outro -- sub + occasional perc clicks
+    "dub_space": [
+        ("sub", 0, 31, 1), ("perc", 0, 31, 4), ("pad", 8, 31, 1),
+        ("kick", 16, 31, 4),
+    ],
+    # 09 trance pluck: kick + sub + arp 16ths + lead
+    "trance_pluck": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 1), ("arp", 4, 31, 2),
+        ("hats", 8, 31, 2), ("lead", 16, 23, 1), ("arp", 24, 27, 4),
+        ("lead", 28, 31, 1),
+    ],
+    # 10 industrial: kick + half stab + perc + sub rumble
+    "industrial": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 2), ("stab", 4, 31, 4),
+        ("perc", 8, 31, 2), ("hats", 12, 31, 2), ("clap", 16, 31, 1),
+    ],
+    # 11 detroit: kick + hats + sustained pad + stab
+    "detroit": [
+        ("kick", 0, 31, 1), ("pad", 0, 31, 1), ("hats", 4, 31, 2),
+        ("sub", 8, 31, 1), ("stab", 16, 23, 1), ("stab", 28, 31, 1),
+        ("hats", 24, 27, 4),
+    ],
+    # 12 trance: rich -- kick hats sub lead pad
+    "trance": [
+        ("kick", 0, 31, 1), ("pad", 0, 31, 1), ("sub", 4, 31, 1),
+        ("hats", 8, 31, 2), ("lead", 16, 23, 2), ("arp", 16, 31, 2),
+        ("lead", 24, 27, 4), ("lead", 28, 31, 2), ("clap", 16, 31, 1),
+    ],
+    # 13 psytrance: kick + rolling sub + acid + sweep zaps
+    "psytrance": [
+        ("kick", 0, 31, 1), ("sub", 0, 31, 2), ("acid", 4, 31, 2),
+        ("hats", 8, 31, 2), ("sweep", 15, 15, 6), ("sweep", 31, 31, 6),
+        ("acid", 24, 27, 4),
+    ],
+    # 14 punkcore: kick + clap snare + hats + stab chord + lead
+    "punkcore": [
+        ("kick", 0, 31, 1), ("clap", 0, 31, 1), ("hats", 4, 31, 2),
+        ("stab", 8, 31, 2), ("lead", 16, 23, 2), ("sub", 8, 31, 1),
+        ("lead", 28, 31, 6),
+    ],
+}
+
+
+def to_sc_literal(g):
+    rows = ",\n ".join("[" + ",".join(str(v) for v in row) + "]" for row in g)
+    return "[\n " + rows + "\n]\n"
+
+
+def main():
+    for name, segs in PRESETS.items():
+        g = build(segs)
+        path = os.path.join(HERE, name + ".matrix")
+        with open(path, "w") as f:
+            f.write(to_sc_literal(g))
+        print("wrote", path)
+    print(len(PRESETS), "presets generated")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/sound_algo/data_only/matrix_presets/hard_pump.matrix b/sound_algo/data_only/matrix_presets/hard_pump.matrix
new file mode 100644
index 0000000..2a40674
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/hard_pump.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/hard_rave.matrix b/sound_algo/data_only/matrix_presets/hard_rave.matrix
new file mode 100644
index 0000000..0399d79
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/hard_rave.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,6,6,6,6],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/hypno_drift.matrix b/sound_algo/data_only/matrix_presets/hypno_drift.matrix
new file mode 100644
index 0000000..6dad909
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/hypno_drift.matrix
@@ -0,0 +1,18 @@
+[
+ [4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/hypno_roll.matrix b/sound_algo/data_only/matrix_presets/hypno_roll.matrix
new file mode 100644
index 0000000..fa1ebb9
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/hypno_roll.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/industrial.matrix b/sound_algo/data_only/matrix_presets/industrial.matrix
new file mode 100644
index 0000000..5598838
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/industrial.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/psytrance.matrix b/sound_algo/data_only/matrix_presets/psytrance.matrix
new file mode 100644
index 0000000..56b914c
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/psytrance.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6]
+]
diff --git a/sound_algo/data_only/matrix_presets/punkcore.matrix b/sound_algo/data_only/matrix_presets/punkcore.matrix
new file mode 100644
index 0000000..bc82e32
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/punkcore.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,0,0,0,0,6,6,6,6],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/trance.matrix b/sound_algo/data_only/matrix_presets/trance.matrix
new file mode 100644
index 0000000..b7ea93f
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/trance.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/matrix_presets/trance_pluck.matrix b/sound_algo/data_only/matrix_presets/trance_pluck.matrix
new file mode 100644
index 0000000..c3f83d1
--- /dev/null
+++ b/sound_algo/data_only/matrix_presets/trance_pluck.matrix
@@ -0,0 +1,18 @@
+[
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,2,2,2,2],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
+ [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+]
diff --git a/sound_algo/data_only/test/test_matrix.scd b/sound_algo/data_only/test/test_matrix.scd
index 30bf8fd..6334ba5 100644
--- a/sound_algo/data_only/test/test_matrix.scd
+++ b/sound_algo/data_only/test/test_matrix.scd
@@ -63,6 +63,49 @@ try {
     ("EXCEPTION in ~matStop: " ++ e.class.name).postln
 };
 
+// -- Persistence: save / load round-trip (touches filesystem, valid headless) --
+~matSetCell.(1, 7, 4);
+~matSetCell.(2, 0, 2);
+
+try {
+    ~matSave.("test grid")
+} { |e|
+    pass = false;
+    ("EXCEPTION in ~matSave: " ++ e.class.name).postln
+};
+pass = pass and: {
+    File.exists(~matDir +/+ "test_grid.matrix").if({ true }, {
+        ("FAIL: save file not found at " ++ (~matDir +/+ "test_grid.matrix")).postln;
+        false
+    })
+};
+
+try {
+    ~matClear.()
+} { |e|
+    pass = false;
+    ("EXCEPTION in ~matClear: " ++ e.class.name).postln
+};
+pass = pass and: { ~lp[\matrix][1][7] == 0 };
+
+try {
+    ~matLoad.("test grid")
+} { |e|
+    pass = false;
+    ("EXCEPTION in ~matLoad: " ++ e.class.name).postln
+};
+pass = pass and: { ~lp[\matrix][1][7] == 4 };
+pass = pass and: { ~lp[\matrix][2][0] == 2 };
+pass = pass and: { ~matGridValid.(~lp[\matrix]) };
+pass = pass and: {
+    ~matNames.(~matDir).includes(\test_grid).if({ true }, {
+        "FAIL: test_grid not in matNames".postln;
+        false
+    })
+};
+
+File.delete(~matDir +/+ "test_grid.matrix");
+
 // ~matEmitTrig must be defined and emit /matrix/trig with amp clipped to 0..1
 pass = pass and: { ~matEmitTrig.notNil };
 ~trigLog = nil;
diff --git a/web_realart/public/control/control.css b/web_realart/public/control/control.css
index 926ac3b..26f88fd 100644
--- a/web_realart/public/control/control.css
+++ b/web_realart/public/control/control.css
@@ -117,3 +117,15 @@ button.queued { animation: queued-blink 600ms ease-in-out infinite alternate; }
   0 0 calc(var(--glow, 0) * 12px) calc(var(--glow, 0) * 4px)
     rgba(255,255,255, calc(var(--glow, 0) * 0.7));
   filter: brightness(calc(1 + var(--glow, 0) * 0.9)); }
+
+/* --- Matrix persistence bar --- */
+.matrix-persist { display: flex; align-items: center; gap: 6px; margin: 8px 0; flex-wrap: wrap; }
+.matrix-name-input { flex: 1; min-width: 100px; background: #1a1a2e; color: #9af;
+  border: 1px solid #335; border-radius: 6px; padding: 8px 10px; font-size: 14px; }
+.matrix-name-input:focus { outline: none; border-color: #4af; }
+.matrix-list-select { flex: 1; min-width: 100px; background: #1a1a2e; color: #9af;
+  border: 1px solid #335; border-radius: 6px; padding: 7px 6px; font-size: 14px;
+  cursor: pointer; -webkit-appearance: none; appearance: none; }
+.mat-action-btn { width: auto; padding: 8px 14px; font-size: 14px; flex-shrink: 0; }
+.mat-refresh-btn { width: auto; padding: 8px 12px; font-size: 16px; flex-shrink: 0;
+  background: #1a2a1a; border-color: #2a4a2a; color: #4d9; }
diff --git a/web_realart/public/control/control.js b/web_realart/public/control/control.js
index 1983bfc..81719a3 100644
--- a/web_realart/public/control/control.js
+++ b/web_realart/public/control/control.js
@@ -1,6 +1,6 @@
 const ws = new WebSocket(`ws://${location.host}/ws`);
 const dot = () => document.getElementById("status");
-ws.addEventListener("open", () => dot().className = "on");
+ws.addEventListener("open", () => { dot().className = "on"; send("/matrix/list"); });
 ws.addEventListener("close", () => dot().className = "off");
 function send(address, ...args) {
   if (ws.readyState === 1) ws.send(JSON.stringify({ address, args }));
@@ -161,6 +161,38 @@ ws.addEventListener("message", (ev) => {
     }
     return;
   }
+
+  // /matrix/list <name1> <name2> ... — populate saved/preset dropdown
+  if (address === "/matrix/list") {
+    const sel = document.getElementById("matrix-list");
+    if (!sel) return;
+    const prev = sel.value;
+    sel.innerHTML = "";
+    args.forEach(name => {
+      const opt = document.createElement("option");
+      opt.value = String(name);
+      opt.textContent = String(name);
+      sel.appendChild(opt);
+    });
+    // Preserve prior selection if still present
+    if (args.map(String).includes(prev)) sel.value = prev;
+    return;
+  }
+
+  // /matrix/grid <512 ints row-major vi*32+bar> — rebuild grid from loaded preset
+  if (address === "/matrix/grid") {
+    if (!Array.isArray(args) || args.length < 512) return;
+    for (let vi = 0; vi < 16; vi++) {
+      for (let bar = 0; bar < MATRIX_BARS; bar++) {
+        const v = Math.round(Number(args[vi * 32 + bar]));
+        matGrid[vi][bar] = (Number.isFinite(v) && v >= 0 && v <= 6) ? v : 0;
+      }
+    }
+    saveMatState();
+    renderMatrix();
+    return;
+  }
+
   // /matrix/trig <vi> <amp> — per-note pulse: glow the active cell of voice vi
   if (address === "/matrix/trig") {
     triggerGlow(Math.round(Number(args[0])), Number(args[1]));
@@ -599,4 +631,18 @@ document.addEventListener("DOMContentLoaded", () => {
     renderMatrix();
     send("/matrix/clear");
   });
+
+  // Matrix persistence bar
+  const matSave = document.getElementById("matrix-save");
+  if (matSave) matSave.addEventListener("click", () => {
+    const n = (document.getElementById("matrix-name").value || "").trim();
+    if (n) { send("/matrix/save", n); send("/matrix/list"); }
+  });
+  const matLoad = document.getElementById("matrix-load");
+  if (matLoad) matLoad.addEventListener("click", () => {
+    const n = document.getElementById("matrix-list").value;
+    if (n) send("/matrix/load", n);
+  });
+  const matRefresh = document.getElementById("matrix-refresh");
+  if (matRefresh) matRefresh.addEventListener("click", () => send("/matrix/list"));
 });
diff --git a/web_realart/public/control/index.html b/web_realart/public/control/index.html
index 12fcf1b..07dd577 100644
--- a/web_realart/public/control/index.html
+++ b/web_realart/public/control/index.html
@@ -158,6 +158,13 @@
     <button id="matrix-stop">STOP</button>
     <button id="matrix-clear">CLEAR</button>
   </div>
+  <div class="matrix-persist">
+    <input type="text" id="matrix-name" class="matrix-name-input" placeholder="nom de la matrice">
+    <button id="matrix-save" class="mat-action-btn">SAUVER</button>
+    <select id="matrix-list" class="matrix-list-select"></select>
+    <button id="matrix-load" class="mat-action-btn">CHARGER</button>
+    <button id="matrix-refresh" class="mat-refresh-btn" title="Rafraichir la liste">&#8635;</button>
+  </div>
   <div class="matrix-scroll">
     <div id="matrix-grid"></div>
   </div>