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That's a great thought, thanks. It could be that the pins are floating before then, and that's why the problem's occurring. Will adjust and report back if it's still happening.

Hi, so I have Teensy 4.0 acting as an SPI slave. — RE: https://forum.pjrc.com/threads/59254-SPI-Slave-Mode-on-Teensy-4 Everything works when the serial monitor is open from a PC, but when it's not... it seems to try to open a serial connection on the default SPI pins (which are being used for...

This code works great as a test for me, but how can we measure between CS low and high, then get an entire buffer of all of the bytes?

Is that the missing piece to make this work? I'm wondering if I can pull A8 into a second channel.

Yes, I posted code in the GitHub issue: https://github.com/PaulStoffregen/Audio/issues/94

OK, that's interesting to hear. I'm a little worried as to why changing ADC0 to ADC1 in the code as a test doesn't work but will keep poking at it. This library's pretty cool. Hoping to make this work somehow.

I've been playing around with a Teensy board and the one real roadblock I ran into was the lack of a second AudioInputAnalog for stereo audio. Not a huge dealbreaker, but as I was thinking about workarounds, I thought back to about how there's a second ADC in the 3.1 board only. Is it possible...