Int 7F Fn 4331  U - Voyetra - Vapisg - Api                                 [s]

   AX = 4331h ('C1')
   BH = C1h
   BL = function (00h-7Ah)
   ???

Return: ???
Program: VAPISG is a MIDI driver by Voyetra for the Aztech Sound Galaxy
     sound board

See Also: AX=4150h,AX=564Dh,AX=5658h