Would seem to be RTFM but no mention in the manual
http://data.manualslib.com/pdf3/67/6...y__fifteen.pdf
All guitar types seem to be set at 100% drive/dirtiness or whatever
distortions. Go to change them in the display and press the now red
"save" button and the display comes up "memory locked" .
Nothing in manual to say how to unlock. A forum for frustrated fenderers
has press Utility button twice but that does not work with this PR 938
flavour of amp.