It appears to work great in Windows, using port 220 for MPU-401, which seems odd.

Through researching on the forums it appears I need a tsr for MPU-401 to work in DOS, with the 688, and I’ve grabbed it from the driver library. ENMPU is the exe and I’ve tried running it with several different settings for the base address and IRQ but I’m mostly guessing. The card doesn’t appear to have jumpers for MPU-401 addressing but I might be wrong. Anyway, anything I try, the Duke3D sound test can’t detect an MPU-401 device. I realize this would probably be easier with another sound card so I’m working to source another with a wave table header. Any help would be appreciated, thanks!