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Thanks for all your help, I do appreciate it.

I rotated the switch 180 and resoldered it. I checked with a multimeter, and the switch seems to me to be working correctly.

ON
J1 -> IN
OUT -> J2
L -> GND

OFF
J1 -> J2
IN -> GND

But.... Didn't make a difference, as the whine and modulated theremin sound is still there. So back to square 1.

I'm super confused. Nothing is connected to pin 7 on the switch board. See the front side pic above. https://www.madbeanpedals.com/forum/index.php?topic=33728.msg323983#msg323983

I labeled the wiring board with all the pin connections. I'm pretty sure this is correctly wired. When the switch is on, the top row is connected:
J1 -> IN (input jack connects to pcb input)
L -> GND (turns on LED)
OUT -> J2 (pcb output to output jack)

When it's off:
J1 -> J2 (full bypass of input jack to output jack)

Here's a front side view of the switch/wiring board.

It's a wiring board from Stompbox Parts: https://stompboxparts.com/pcbs/wiring-board-for-3pdt-footswitches/.

1. Input signal to FX PCB
2. Input signal from input jack
3. Ground
4. Output signal from FX PCB
5. LED
6. Output signal to output jack
7. Ground

The connection from the PCB is:
GND -> 3. Ground
L -> 5. LED
IN -> 1. Input signal to FX PCB
J1 -> 2. Input signal from input jack
OUT -> 4. Output signal from FX PCB
J2 -> 6. Output signal to output jack

Hey everyone. I decided to dip my toes into pedal building, and decided to start with a Mudbunny 2020.

The actual build went pretty quickly and smoothy, until I ran out of my favorite solder, and found some Bernzomatic rosin core in my supplies that I ended up not liking at all. But I finished everything, and after reflowing some joints I got the board LED to light up.

I plugged it into my amp, and there is a lot of noise with it off, which should have been bypassed. The noise increases with the Volume, and alter with the Sustain and Tone pots. When I turn it on, it makes a constant loud whine that modulates with the Volume, Sustain, and Tone pots.

Here's a video of the noise and whine.
https://youtu.be/xZmly0GMrAY

I took a look at all the solder joints and reflowed some that seemed dull, and checked continuity, but no dice. I'm pretty much stuck, and have no idea how to fix this.

Here's the voltage measurements:

DC +: 8.75 V from the wall wart

All transistors are 2n5088.

Q1
C: 4.036
B: 0.635
E: 37.5 mV

Q2
C: 4.05
B: 0.634
E: 37.4 mV

Q3
C: 3.98
B: 0.63
E: 37.8 mV

Q4
C: 4.774
B: 1.44
E: 0.862