Added tests to try to reproduce #20

host-apps/tests/Makefile

@@ -0,0 +1,11 @@
+MIDICTRL_LIBS = GUI Elektron MidiTools
+
+include ../../makefiles/Host.mk
+
+all: SendProgramChange
+
+SendProgramChange: SendProgramChange.host.o $(OBJS)
+	$(CLDCXX) $(CLDFLAGS) -o $@ $^
+
+clean:
+	- rm -f *.o SendProgramChange

host-apps/tests/SendProgramChange.cpp

@@ -0,0 +1,21 @@
+#include "Platform.h"
+#include "Midi.h"
+#include "MidiUartHost.h"
+
+int main(void) {
+  MidiUart.init(1, 1);
+
+  for (int i = 0; i < 20; i++) {
+    MidiUart.sendProgramChange(i);
+    MidiUart.runLoop();
+    delay(100);
+  }
+
+  for (int i = 0; i < 20; i++) {
+    MidiUart.runLoop();
+    delay(200);
+  }
+
+
+  return 0;
+}

minicommand-sketches/TestFirmwares/ForwardPrgChange/ForwardPrgChange.pde

@@ -0,0 +1,29 @@
+#include "Midi.h"
+
+class ForwardPrgChangeSketch : public Sketch, public MidiCallback {
+  CCEncoder encs[4];
+  EncoderPage page;
+
+public:
+  ForwardPrgChangeSketch() :
+    page(&encs[0], &encs[1], &encs[2], &encs[3]) {
+
+  }
+
+  void setup() {
+    Midi.addOnProgramChangeCallback(this, (MidiCallback::callback_ptr_t)&ForwardPrgChangeSketch::onProgramChange);
+    setPage(&page);
+  }
+
+  void onProgramChange(uint8_t *msg) {
+    MidiUart.sendProgramChange(MIDI_VOICE_CHANNEL(msg[0]), msg[1]);
+  }
+};
+
+
+ForwardPrgChangeSketch sketch;
+
+void setup() {
+  sketch.setup();
+  GUI.setSketch(&sketch);
+}