No, I reckon this sounds like a temperature-sensitive RAM part that is affecting the playback. Timings of these chips can change at the limits of the chip's specified operating range. Unless you specify MIL-spec parts, you won't escape temperature sensitivity.

Empeg seems to have suffered from a bad batch of Siemens RAM parts. What you should do is get the thing to stutter at high temperature, then pull it and get it inside to AC power and conenct it to a terminal. Rut the RAM test from boot (the CTRL-T trick) and report the results to [email protected].

One of the few remaining Mk1 owners... #00015