First of all you should check that the setup of the games sound is corresponding to the way DOSbox is set up. In the DOSbox config file there should be a section looking something like this:
Quote:
[sblaster]
# type -- Type of sblaster to emulate:none,sb1,sb2,sbpro1,sbpro2,sb16.
# base,irq,dma,hdma -- The IO/IRQ/DMA/High DMA address of the soundblaster.
# mixer -- Allow the soundblaster mixer to modify the dosbox mixer.
# oplmode -- Type of OPL emulation: auto,cms,opl2,dualopl2,opl3.
#* * * * * * On auto the mode is determined by sblaster type.
# oplrate -- Sample rate of OPL music emulation.
type=sb16
base=220
irq=7
dma=1
hdma=5
mixer=true
oplmode=auto
oplrate=22050
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Now you just need to make sure to use these values when setting up the sound for your games. I can't remember if I made any changes to these values, so check what they are in your own config, instead of using the ones I've posted here.