Weeeeellll, the Gristlelizer still isn’t working, but some progress is being made. All the symptoms remain the same, i.e. the LED blinks, and sound gets through in bypass mode, but not in effects mode.
I replaced all of the integrated circuits, and also some of the resistors. Replacing the resistors was actually a dumbass mistake — as I was testing the resistors with the multimeter, I was thrown by the off reading I was getting for many of them. Of course, the problem is that I forgot that resistors in a circuit will be affected by the other components around them, so the “inaccurate” performance I thought I was seeing was, in fact, exactly what I should have been seeing.
Kerry made an extremely helpful suggestion, involving using the Level pot as an improvised audio probe to trace the signal through the circuit to discover where it stops. I’ve done this, and now I’m really stumped. Here’s the deal: The signal seems to be fine when it reaches IC4, which is the first IC it hits. But there’s no output from the IC on terminal 6. So that’s where the signal is getting stuck.
You’d think simply putting it a new IC would fix the issue, right? Wrong. So my electrons are evidently getting stuck in IC 4 and not progressing through the rest of the circuit. I’m busy eddycatin’ myself about what might be going on here — if nothing else, this project has certainly been a great learning experience — but I feel like I’m a long way away from figuring this out.
If anyone has any ideas about what the problem might be, please chime in…