Inca's original requirements:
MS-DOS 5.0 or Windows 3.0 or greater
386 or better
2 MB RAM
19 MB Hard drive space
Sound Card W7DAC Pro Aud Spectum, SoundBlaster, Sound Source, Thunderboard or MT-32/LAPC-1/CM-32L
Audio problems are common in the later Sierra DOS games. There's no single fix for all these games.
Solution 1 (preferred):
Play the game in DOSBox. It also will work with the MT-32 sound module, if you are fortunate to have one.
Use VDMSound. The game work well with VDMSound. The sound will be as good as your audio hardware, and as with DOSBox, it works with the MT-32 sound module.
Play the game with FreeSCI, a third party Interpreter for Sierra's early SCI games.
Solution 4 (DOS/Win9x):
Install DOS drivers for your soundcard. Without DOS drivers installed you won't have sound in a DOS window in Windows 9x. If you can't find DOS drivers for your soundcard, there is an alpha (developmental) version of VDMS that you can try.
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