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[verr76]

Thanks for the instructions!

You just learnt to me an import thing I still didn't get.
The two EQs should be a simple tonestack, and I guess, a Marshall style could be more appropriate. I see that trimpot, it is the Tone control, probably.

To recover the volume loss you advice to play with R12 - 22k, that should be control the gain of the last op amp stage.
But, could we try to decrease R11 - 47k? Or is right this the thing you advice not to do?

Yes. That works to. If you do a quick search for the schematic you'll see it sometimes at lower values.
Mine's at 4k7 actually.
And yes, the trimpot is the original tone control. You can leave a resistor for that to.

[studiodunn]

Amazing build!