DOOM v1.1 has a bug that keeps the Sound Blaster Pro from working on IRQ 2, and later versions do not allow usage on IRQ 10. [18-3]: Why won my Gravis UltraSound work with DOOM?
To get DOOM to run properly with both music and digitized sound effects on the Gravis UltraSound use these three steps. ////// SOUND ////// • Set your ULTRASND environment variable, and use GF1 IRQ less than 8 example: SET ULTRASND=220,1,1,7,5 |_______ GF1 IRQ NOTE: DOOM v1.2 may be able to use any valid GF1 IRQ including 11,12,15. However, high IRQs are _not_ recommended. See BUGS. ////// MUSIC ////// • Doom requires that you have installed the General MIDI patch set from the 2.06a Install Disks (or later) that came with your UltraSound (and are also available via FTP and BBS). DOOM will find your patches (using the ULTRADIR variable) in the MIDI subdirectory pointed to by ULTRADIR. example: SET ULTRADIR=C:\ULTRASND (DOOM will look in C:\ULTRASND\MIDI for the patches) NOTE: Step 3 is only required for DOOM v1.0 / Operating System 0.99 • You will also need to copy ULTRAMID.INI into your DOOM directory and rename it to DMXGUS.INI (or find and use the DMXGUS.INI file). ULTRAMID.INI is a
