cycle only? no randomization at all possible?
I never tried this, but there are 1 or 2 examples of using the ALT group, I think there are lots under muzzles (gun shot) in the SoundEffects.sounddata file.
Ya, just looked them up
It looks to me like it may use any of the sounds with the name or with the name and ALT_1 or ALT_2 etc.
EDIT: Audio responses do not 'need' to be in stereo, in fact, I recommend mono ogg or mp3. Why waste resources on 2 channels for that stuff. Use different qualities of conversions to also save your resources. Explosions should be very HQ and voices can be lower quality, with everything else somewhere between.