I bought a Receptor Quattro used off ebay a few years ago (before Muse went out of business). My band still uses it for live shows, although it's not very stable. It freezes up, note offs become note ons, and the sustain pedal suddenly reverses function. The owner Bryan had been receptive to emails for a few years, but now isn't responding. I also had a name of a former employee that offered support for an hourly fee, but now I'm having trouble getting a response from him. Anthony, I sent you a PM to see if it's the same guy.