Thanks. I realise this would be challenging just looking at it. My other project is using SMT32 blue to set up a modular design environment using an external DAC first with PCM5102A which is just stereo.
Are there any DACs you could recommend that are quad or octal that would work with the Daisy Seed and SAI? SAI sounds easier.
I read here the Daisy Seed does support I2S but you need to program the STM32 it and write your own driver if unavailable.