A context alarm, a user defined callback installed with MidiSetApplAlarm.
typedef pascal void (* ApplAlarmPtr)( short refNum, long code );
refNum
- a 16-bit integer, it is the reference number of the application.
code
- a 32-bit integer, the context modification code : 0xRRRRMMMM where RRRR is the Reference number of the involved application and MMMM the type of change (see MidiChangeCodes).