Keep in mind @BJG that with you switch as is, the BIAS control will only be useful when the selector switch is engaged one way. Not sure if you want to incorporate that or not into both transistors.
You're soldering looks ok for the most part. I would reflow all joints just to make sure nothing is cold. Also, have you confirmed each and every component value (resistor and capacitor)?
This board is definitely a rite of passage if you're into muffs. I've probably spent more time flipping switches on it that actually playing through it. One of the reasons why it just stays on my shelf....
Nice build, though!
@MichaelW any requests? Happy to help. There are a few other threads I made to help push in the right direction.
https://forum.pedalpcb.com/threads/designing-stripboard-layouts-part-1.24472/
https://forum.pedalpcb.com/threads/designing-stripboard-layouts-part-2.24515/
Makes sense to me. Your coupling cap for the audio probe doesn't need to be that big (1uf OR 630V). For guitar, a "standard" 100nf box cap will work just fine. If you've got the space you can use a 1uf box cap.