fix(sound): squat empty-skel + stop restore

sound_algo/data_only/concert_gestures.scd

@@ -23,7 +23,8 @@ var meanY = { |a, b| (((a ? ())[\y] ? 0.5) + ((b ? ())[\y] ? 0.5)) * 0.5 };
 ~ccGestureAdd.((name:\squat, family:\fx, hold:0.6, cooldown:0.2,
     detect: { |pose, prev|
         var s = pose[\skel];
-        s.notNil and: { meanY.(s[\hipL], s[\hipR]) > (meanY.(s[\kneeL], s[\kneeR]) - 0.10) } },
+        (s[\hipL].notNil and: { s[\kneeL].notNil }) and: {
+            meanY.(s[\hipL], s[\hipR]) > (meanY.(s[\kneeL], s[\kneeR]) - 0.10) } },
     fire: { ~ccMaster[\filterTo].(450, 1.0) },
     release: { ~ccMaster[\filterTo].(20000, 1.5) }));
 

sound_algo/data_only/scene_concert.scd

@@ -178,6 +178,10 @@
     ~concert[\clock] !? { |c| c.stop };
     ~concert[\clock] = nil;
     ~concert[\running] = false;
+    // restore the master event-FX so a stop mid-squat/spin doesn't leave the
+    // mix muffled / stuttering for the next set
+    ~ccMaster !? { ~ccMaster[\filterTo].(20000) };
+    ~ccStutter !? { |st| st.set(\mix, 0) };
     "[concert] STOPPED".postln;
 };