I don't understand why so many people, especially musicians, lack the tweaking gene. The first thing I do when I get a new device, is to explore all the possible ways it was designed to be tweaked, and then find out what new ways people have discovered. The volume and Q pots are part of the 105Q manual, and the auto off timing pot is pretty well documented on the intranets. I love it when someone buys an old tube amp and complains that it's just crap, then sells it, never even trying new tubes or different speakers. It took me weeks to figure out that my EBS Bass IQ filter was gonna be a keeper. Come on people, that's half the fun. Mess around, experiment, learn something.
BTW, the 105Q is a killer WAH! IMHO
JBY
BTW, the 105Q is a killer WAH! IMHO
JBY

Considering it's been dropped down stairs twice - that's not bad at all.
Can't quite remember, but I'm sure it was only one resistor to change right down near the heel of the circuit board IIRC.