Teensy 4.1 native SPDIF out doen't synchronize

[DragonSF]

I tried 3 different devices (with 44.1kHz SR SPDIF in) to connect to the T 4.1. The best I got was some expected sound with lots of clicks and noise. The other 2 just produced noise. The same program worked with the T 4. What am I'm missing here?

[Frank B]

From that absolute minimal information nobody can answer it.
The code is the same on T4/T4.1.
Maybe the crystal is a bit off. It gets better when you cool or heat the teensy, it's a crystal problem.
Or just a electrical problem.

[DragonSF]

The problem went away, as soon as I removed the delay from the design.Although the USB had no real problems (besides the usual clicks), the SPDIF went bonkers. Without delay: no problem. Thanks Frank.
(I'm aware,that my information was a little vague, but I didn't want to paste 30000 lines of code here). My program is not only a 6 voice synth, but also a sophisticated MIDI controller.)
Anyway, good to know, it's not a HW issue.