PITCH/RATE deck: Rate and Pitch knobs compounded into one read increment, on a three-state commit predicate and payload v16

src/core/instrument/engine/live_params.cpp

@@ -16,6 +16,8 @@ LiveValues foldLive(const PlayParams& params) {
     v.adsr = params.adsr;
     v.ampAhd = params.trigAhd;
     v.pitchEnv = params.pitchEnv;
+    v.playRate = params.playRate;
+    v.pitchOffsetSemitones = params.pitchOffsetSemitones;
     return v;
 }