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ic100 voltages look all wrong. pin 1 and pin 8 are tied together in the schematic so should be the same and should be around 9v. pin 5 should be around -9v and powers the other ics. without the correct voltages here nothing else can work. interestingly, the power pins on the other ics are...

Hopefully that will fix it. If not, another thing to consider is that these switches can be damaged by heat pretty easily. Leaving the iron on a lug too long can break it beyond repair. Doing too many lugs in quick succession without a break to cool can also do it. If changing the jack...

First thing is going to be to make sure that the BBD bias is set correctly. You can't guarantee to get any wet signal without doing that.

So been there done that

If you are concerned, I would measure the resistance with light on it, and then covered (with a finger maybe) and compare the results with one (or more) of the others. If the results are consistent it's probably fine.

No knobs just adds to the mojo

The circuit for the bypass LEDs is a simple on/off switch. You shouldn't be getting any light when bypassed, so that is a sure sign it's not quite right.

Before catching fire they get this really nice red glow happening

I lost the 15V zener that was regulating power to the EQ board in my bass amp once. In that case a very very hot signal had fried all the op amps on the board and they had failed short circuit, so there was way too much current being drawn for a split second until the main fuse blew. Too much...

The pots we can see look as if they are insulated on the back with electrical tape. If that is the case that may well be your problem if all the other pots are done the same way. That tape is very prone to being pierced by the cut ends of soldered leads. That would also explain things getting...

With these, the trick is usually to look from the end. One side will be straight up and down (or close to). The other side will be a double wedge. The datasheet will show which side is which. In your photo, the straight side is on the right and the "wedged" side is on the left Edit...

Photos of the solder side will probably help. Given that one side is working, your power is probably working, unless there is a broken track or poor solder. An audio probe will probably show you where the signal is being lost. That will then show you where to look - most likely it is a bad...

I am not sure if this matters or not, but the only difference I can see that is in the audio path that is common to all the octaves is that there is a capacitor and resistor missing in the output of the pedal pcb schematic. This is the output section. C8 goes to the line that carries the mix...

90% of the time if a pedal works out of the box and doesn't when it's in the box, it is either bad offboard wiring, or something touching something that it shouldn't be. Have a look for shorted components on the board (pots are prime candidates) and badly wired jacks. When you tried it out of...

I think that in your situation before I replaced anything more I would trace through with an audio probe just to see what happens to the signal. That should hopefully give you some idea which component is busted.

The photo isn't clear. I am a bit sus of the soldering on the transistors, but it is hard to tell. What voltages are you getting on the IC?

What behaviour are you seeing from the gain control? The gain on this does 2 things. It increases the gain (which should introduce some dirt). It also pans from an all clean signal to an all dirt signal (not that this ever gets really dirty). It is possible therefore to have the dirt part of...

If you have 2 identical resistors to make up a voltage divider, and the divider is not giving you half voltage then there is a lot more current drawn from one half of the divider than the other. I would be guessing a blown component that is not fully shorted to a power rail

There are a couple of tantalum caps on the board. If they are C5 and C6 then they are polarised - tantalum caps are definitely polarised.

I am guessing the capacitor doesn't fit. It looks as if the leads are not touching anything they shouldn't, but you are just asking for trouble. I would be covering them with heatshrink just to make sure for all time.