I never had a problem with sound in either VDMSound or DOSBox. The last time someone talked about this and actualy brought an answer, the guy sais his speakers were blasted...
So, if you can't find a reason why it is not working, try to borrow the speakers of someone you know works fine and try it on your own computer.
If this achieve the same result, I would guess that it is hardware dependant. Do you have a sound card or you are using the built-in soundcard of your computer?
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