I would like to get rid of the tone-control, as I have got a ToneTweq in front of it (and lacks space on top of 3-1 pedal 😉 C4 is not needed and the tone pot also goes, but do I need to put some resistor in place of the pot , and at what value ?
I also plan volume-controlling. I reckon a 50K / 10K trim parallel with the 39K (R9) , activated along with Diodes on switch,  should be able to dial in some more volume if set set correct ? (and later substituted by “real” resistor)