Can't reassign DMA channels on sound card

Forgive me if this is in the wrong place. It seems to apply to hardware, but it could also possibly count as a games problem.

For a while, I've been unable to run Rise of the Triad, Blood, or any Build engine FPS games with any sound (I've just recently been able to get the music back for some reason, though). I used to be able to, but it just suddenly stopped one day, seemingly unprovoked. When I frob the settings in the games' Setup programs, it always says the problems are with a conflicting DMA channel, no matter what DMA settings I choose.

The Device Manager lists my sound card as "Aztech 2320 Compatible PnP Audio (WDM)" version 1.0.01 (it came with the computer, and the computer itself is relatively old. It's still running Windows 98). Under the Resources tab, I got this:

Interrupt Request 5
Direct Memory Access 01
Direct Memory Access 00

Now, the IRQ 5 and DMA 1 are all well and dandy. The problem is with the second DMA being set to 0. The games I'm trying to run can only use channels 0, 1, or 3 for the 8-bit DMA, and 5, 6, or 7 for 16-bit. I tried to reassign one of the card's DMAs, but it won't accept any values other than 0, 1, or 3 for either slot. Anything else, and it says "Windows cannot determine if the setting you have selected conflicts with another device." This is rather interesting, because according to my System Information, 5, 6, and 7 are all free.

I figure one possible solution would be to remove the device and reinstall it using the Control Panel. However, I'd like to 1) know if there's an easier solution, and 2) make sure this isn't a really stupid idea.