Driftwood and others,
Now I know what the problem is with my TBSC under Windows 98SE: The compatibility issue's not between the most recent VxD driver for that OS and the OS or AMD Athlon XP CPU, but it's a conflict between that VxD driver and DirectX 8 or 8.1. But unfortunately, the latest drivers for the Radeon- and the GeForce-based graphics cards require DirectX 8 or higher in order to function properly (if at all). And Turtle Beach, as I stated, is no longer updating the VxD drivers for the Santa Cruz. (The only workaround for that compatibility issue is to reformat the hard drive, reinstall Windows 98SE, and install DirectX 7 instead of DirectX 8 - in other words, "downgrade" your version of DirectX.)
There are three possible solutions:
1. Upgrade to a newer Windows OS (Windows Me, Windows 2000 or Windows XP), and use the WDM drivers instead, OR
2. Replace the TBSC with a different sound card (I don't want to spend any more money at this time, so my choice for an alternate sound card are: a. SB Live!; b. Creative/Ensoniq Sound Blaster PCI64; c. Integrated SiS AC97 audio), but keep my R8500 and Win98SE, OR
3. Keep my TBSC and Win98SE, but downgrade to an older graphics card (such as a WAY outdated ATI Rage Pro Turbo).
(FWIW, I went with #1 above, which is also ideal for most users.)
In addition to the above problem, there's another compatibility issue with the TBSC, this time between the Santa Cruz Control Panel and newer versions of the Gravis Experience drivers for Gravis game controllers. Currently there are four solutions here:
1. Downgrade the Gravis Xperience software to an older version (that means no support whatsoever for Windows OS releases newer than Windows 98SE), OR
2. Forget about the Gravis software, and use generic DirectX-supplied drivers (that means you'll either have to use a USB-compatible Gravis game controller or upgrade to Windows XP), OR
3. Simply replace the Gravis controller and switch to a different brand, OR
4. Switch to a different sound card, but keep your Gravis controller and newer Experience software.
(Here, I went with #2, but the ideal choice may be #3.)