// midi_cb.h header file for midi_cb.dll
void CALLBACK _export MidiOutCall (HMIDIOUT hMidiOut, UINT wMsg,
DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);
void CALLBACK _export TimeCallback (UINT nTimerID, UINT wMsg, DWORD dwUser, 
DWORD dw1, DWORD dw2);