"Unknown Multivoc error code." on OSS4

[Xylemon]

I am unable to play Chocolate Duke3D on my OSS4 Linux system. If SDL is set to output to ALSA, it loads up. However, if I set SDL to use dsp (the OSS output mode) it refuses to launch with this message in terminal: "Unknown Multivoc error code."

Any ideas? I'd really like to not use ALSA emulation for this, especially since I don't hear any music under ALSA emulation mode for whatever reason.