@ motorollin
Yeah, the eaudio replacement is fine for Payback on my Peg2 (though performance is lousy for Say, of all programs).
Once it's installed and updated, just run the setup utility to pick software and hardware rendering screenmodes, enable hardware rendering, and start it up. Use the 68K executable, though. The WarpOS version bangs the hardware (performance reasons on classics) so even eaudio won't get you any sound with that version.