Report the instrument's automatable parameters to the host under a frozen id table, in signal-flow order, with real units

42 of 44 ids issued: pitch key-track and Trigger length stay reserved
pending a live path. Master gain reclassified Live — it never reloaded.

src/shell/instrument/editor_input.cpp

@@ -85,6 +85,13 @@ void ReaSamplerEditor::onMouseUp(int x, int y) {
         invalidate();
     }
     if (drag_ == DragKind::kNone) return;
+    // Stack RAII rather than a call at each exit: this handler leaves through several early
+    // returns, and the release commit's final performEdit must land INSIDE the bracket the grab
+    // opened while the bracket itself may not outlive the handler on any path.
+    struct GestureClose {
+        ReaSamplerProcessor* p;
+        ~GestureClose() { if (p) p->endParamGesture(); }
+    } gestureClose{processor_};
     const DragKind kind = drag_;
     const int paramId = dragParamId_;
     const int curveIdx = curvePointIndex_;
@@ -107,9 +114,7 @@ void ReaSamplerEditor::onMouseUp(int x, int y) {
     // directly. Voice count: the label/needle tracks live during the drag but the engine
     // rebuild (setVoiceCount) fires ONCE here on release — not per integer step.
     const bool deckTransient =
-        kind == DragKind::kDeckKnob &&
-        (paramId == -2 || paramId == static_cast<int>(ParamControl::kVoiceCount) ||
-         paramId == static_cast<int>(ParamControl::kMasterGain));
+        kind == DragKind::kDeckKnob && deckKnobIsProcessorSide(paramId);
     if (kind == DragKind::kScrollThumb || deckTransient) {
         // Commit the voice count now that the drag is complete (one rebuild per full drag).
         if (deckTransient && processor_ &&