(from discussion with factory tech 8/26/98)

168RC is very sensitive. For best results plug into a UPS and use "High quality" midi cables. The least bit of AC problems or induced noise on midi cables will cause problems such as audio noise, confusion in settings, or complete lockup of machine.

Diags:

Loop Midi In and Out.
Hold down MISC & SAVE while powering up.
Use MUTE button to step