The 7800 ProSystem emulator for Windows (v1.3) works great on my Linux box. I am running Ubuntu 13.04 (Raring) 64-bit with the Wine 1.6 series.
I am not sure what distro you are running, but overall the process would be: - set up wine repository - install wine - download 7800 ProSystem zip and uncompress - run "wine ProSystem.exe" Voilà. Sound and video work just like in Windows.