unfortunately I just removed a capacitor by mistake on my teensy 4.0, it is the "c17" according to the schematic. So far I could not determine what is not working, but probably something will now be fehlerhasft, I suppose. I implement this Teensy in a larger project, for the later troubleshooting (certainly there will alwayswieder errors) it would be good for me to know what this capacitor was there.
There are several other caps on the 3.3V rail of different values. Each value is there to bypass noise of a certain frequency band. The bands do overlap so missing one cap will likely not have a huge effect.
ah ok! I realized yesterday that I must have actually broken something, the AUDIO OUT1B doesn't seem to work anymore (PIN 32). I use the board with 2 audio shields (four Outputs), for this you need the audio out at PIN 32. As digital input PIN 32 still seems to work (I tested this with a button). Too bad, but nciht so bad, fortunately I have another Teensy lying around.