How to Troubleshoot Pedal Pi

It sounds like you've planned my weekend for me. I will definitely get back with an update once I unbox this thing and try it out.

So here is the update. Having 2 separate Pi's (now), I discovered that regardless of the software image I used, there was always a discernible waveform when running the signal generator on the unadulterated PI. The PI with the header socket mounted to is (which has been my only PI until today), did not have a waveform that looked remotely structured.

Any thing you can recommend before I try and remove the darn header socket? Any suggestions on the *best* way to desolder one of these things from the PI?

Again - thanks so much for the support.

Major update. To answer your question, I didn't have either attached to the Pedal PI. I was running them unattached. The PI that had the header socked installed was not functioning. So I started to unsolder the header. This turned out to be a pain. I stopped. And just for fun, I plugged it back in. This time, the signal generator worked and output to the Pedal PI. But the input did not. So I resoldered the SPI interfaces.....and SURPRISE! It passed audio through.

Now, that's the good news. The next part is my next issue.

There seems to be a weird distortion after playing a few seconds on the tremolo. It plays fine, then gets distorted, then gets fine again.
There seems to be a weird pitch shifting with the delay (and the distortion mentioned above).
There also seems to be a weird pitch shifting with the bit crusher (and the distortion mentioned above).

Sadly, this did not - but at the very least I am in a semi-working configuration now. I can troubleshoot a lot more effectively now that I have output. Thanks again for all of the assistance. If anything else comes to mind as to what the source of the distortion is (by the way, it is periodic and comes and goes at regular intervals), please let me know.

Best Regards

So I just got my pedal pi together and the voltages test ok, however I am completely new to raspberry pi, and C for that matter. I've done a little bit of Unix a long time ago making a hackintosh. I can't seem to get the libraries connected right.. I am using a Pi 0 W if that makes any difference. My soldering job on the 40 pins is the only thing I'm a little worried aobut, But I figured hey it turns on. So I've just been trying to test a program and have tried the triangle generator and hardware detect over and over. Sorry I'm a total noob. imgur.com/a/GEeuL