Thank you very much for the additional information and explanation.
I will test with writing 48000 to SCI_AUDATA after the device is out of reset. A first quick test showed that I can lower the delay of the amp to 160ms. Need to do further testing for sure.
Thank you all for your help. Really appreciate it!
Designing hardware that uses VLSI Solution's devices as slave codecs such as an external MP3 decoder chip for a host microcontroller.