By the way, I have just now updated the BlueGigaEmpeg code on GitHub to be the version that works with V523. It's possible that some of the track desynchronization issues you had yesterday were due to the fact that I hadn't uploaded a version of the code that was compatible with the deduplicated Hijack version.

It also contains your Pin 51 reset line code, though it is disabled at the moment (commented out and/or with a return statement preceding it, depending on where in the code you're looking).

If you want to re-enable the reset line, look in the code for all occurrences of the variable "ResetLinePin" and make the necessary changes near those points.

Also the version up on GitHub is configured for analog input instead of I2S input at the moment, change the corresponding line if you want to switch it to I2S.