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Thanks for all the help. I am able to do what I originally wanted to start with, which is to direct the input to the output. I never got the fft output working as expected, perhaps because I don't really know how to control the serial plotter. For anyone who might want an answer to the...

That circuit works for me now, as I said. The problem was the capacitors I am using. If I put input into that circuit, the output of the circuit connected to a speaker yields the sound as expected. I now assume that part is ok. However, the input to the Teensy 4.1 seems to be the problem now. I...

Thanks for the tip. So far I'm just using a breadboard. I was using capacitors with "10" printed on them which I had assumed was 10 microfarads, but it seems that was not the case. I replaced those with 2 pairs of 22 microfarad electrolytic capactiors in series (I didn't have any 10 microfarad...

Thanks for the info. Mine doesn't work like that. In fact, if I connect the conditioning circuit directly to a speaker, I get no sound, whereas if I put the input directy to the speaker, I do. I have carefully checked that I made the circuit as in your diagram. Is it possible to use it without...

Thanks for the info. I have made the conditioning circuit and have connected it to the input. I get a lot of numbers on the screen, but nothing seems to change when a sound signal is directed to the input. Can you please elaborate on how to get it to work and what is supposed to happen when it...

Thanks for your reply. I have now tried that pin but no luck. Reading the info, I think that might just be for Teensy 4 not 4.1. The two are very different so it is unlikely that it would happen to be the same pin. I would like to know how to test it, so if anyone has some code with which I can...

I have a very basic question. I want to start by taking audio input and simply directing it to the audio output. I'm going to do more with it later but that's my starting point. I know that the output works. I have my speaker connected to pin 10 on the Teensy 4.1 and I am using this sample...