How often have I seen this. Everything seems to work component-wise
perfectly ok but something is not right. Its due to something I'm doing
wrong, either a case of RTFM (no ref to this in the owner manual) or
looking too logically at musician stuff.
The front panel has a specific section labelled Lead Gain with a line
extending out to the PRE pot and POST pot. The next section is marked
Normal Gain pot.
I was turning both "LEAD" pots to min for f/s engaging of normal and
vice-versa for lead channel, but there must be some advancement of the
POST pot for either channel to work, only seeing that in the schematic