class MidiTracer;
class WindowProxyBase;
class GlobalPortMatrixWindow;
+class GUIObjectState;
namespace Gtkmm2ext {
class TearOff;
void xrun_handler (framepos_t);
void create_xrun_marker (framepos_t);
+ GUIObjectState* gui_object_state;
+
AudioClock* primary_clock;
AudioClock* secondary_clock;
AudioClock* preroll_clock;