Int 7F Fn 5658  U - Voyetra - Vapisg - Api                                 [s]

   AX = 5658h ('VX')
   BH = C1h
   BL = function (00h-1Bh)
   ???

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

See Also: AX=4331h,AX=564Dh