How can I increase the gain in the Angry Andy Plus?

Increasing the drive pot to 250k would add much more gain.

Or you could increase r5 but that's also setting the lowest available gain and you'd need to goose it quite a bit from 1k to get an appreciable difference, but you could socket it and see how a 5.1k treats you.

There's also a 1m across the second op amp stage which you could increase to 1m5, 2.2m, but be sure to change the feedback capacitors accordingly (if one goes up the other goes down) to keep the filtering the same.
 
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