Owner just needed a simple practise amp, but ended up with this thing
that is way over the top and needs driving lessons before you can use it.
Reminded of the acoustic bass player and his Roland Cube that kept
returning to me as it distorted, but absolutely no problem that I could
find.
Eventually it emerged he just wanted a simple but small amp and speaker
for his bass and ended up with all this DSP stuff. His opinion was that
as he didn't want any of the features other than volume , he turned all
the controls anti-clockwise. That put the "type" feature into octave
bass under-imposing an octive under his acoustic bass, hence the
observed "distortion"