#define MIDICLOCKNAME "MidiClock"
#define mc_data(t)    ((struct MidiClockData *)(t)->tc_UserData)
#define mc_counter(m) ((m)->counter)
#define mc_intrval(m) ((m)->intrvl)

struct MidiClockData { /* where timer process writes its data */
	unsigned long counter;
	unsigned long intrvl;
	};

struct mc_Msg { /* message structure for communicating with timer process */
	struct Message msg;
	unsigned long command, data;
	};