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I confirmed this USB audio issue:

https://forum.pjrc.com/threads/61142-USB-Audio-Frame-Sync-on-Teensy-4-0

> Think will need to convert many many %u %x %d to %lu %lx %ld Will be sort of a pain!

> printf("uint32_t var : %"PRIu32"\n", u32x);

I see one here:
Audio/input_adc.cpp:341:45: warning:...