I don't know this machine but I know Suntronics. The late Ron Sundell, the owner, was a genius at wringing out the best possible performance from the TEAC/TASCAM line of machines and consoles. Among other things, he converted 3300 1/2 tracks to 30ips machines. I'm guessing that the unit in question here is one of his prototypes. Of what, I have no idea.