rewire keyboard playthrough for correct channel as well

main.cpp

@@ -237,6 +237,7 @@ public:
         for (Jack::NFrames i = 0; i < midi_inp->get_event_count(); ++i) {
             MIDI::Message ctrl_msg;
             if (midi_inp->get_event(ctrl_msg, NULL, i)) {
+                ctrl_msg.channel = model->midi_control_channel;
                 midi_omni_out->write_event(0, ctrl_msg);
                 midi_ports[model->midi_control_port]->write_event(0, ctrl_msg);
             }

model.cpp

@@ -428,6 +428,7 @@ Model::Model() {
 void Model::reset() {
     end_cue = 0;
     midi_control_port = 0;
+    midi_control_channel = 0;
     beats_per_minute = 120;
     frames_per_beat = 4;
     beats_per_bar = 4;

model.hpp

@@ -276,6 +276,8 @@ public:
     
     // what port to use for the midi control
     int midi_control_port;
+    // what channel to use for the midi control
+    int midi_control_channel;
 
     void reset();
     

trackview.cpp

@@ -110,6 +110,7 @@ bool TrackBar::on_name_button_press_event(GdkEventButton *event) {
         (event->button == 1)) {
         Track &track = model->tracks[index];
         model->midi_control_port = track.midi_port;
+        model->midi_control_channel = track.midi_channel;
         return true;
     } else if ((event->type == GDK_2BUTTON_PRESS) &&
         (event->button == 1)) {