I don't think so. Yes, your on-board sound is where the problem lies. You'll either have to get a seperate sound card with DOS drivers, or find DOS drivers for your sound chip. And since 99% of chipsets that come out these days don't have DOS drivers (which sucks, but makes sense from a $$ POV) you'll have to pick something up. Probably like a SoundBlaser 16 PCI card.
With a couple of my classics cabinets, I've been blessed with finding the DOS drivers, so i don't have extra cards hanging off the mounted motherboard. ATI Rage graphics, Crystal sound, it's a neat setup. I couldn't do that with a modern board because of the sound drivers. A lot of onboard video could likely work getting it to 15KHz, but sound...