I am struggling to stop and play multiple WAVs from a fast SD card on T4 without glitches
In the audio sys design tool uncommenting #define USE_TEENSY3_OPTIMIZED_CODE in SD_t3.h is mentioned for improving things.

Would this still be of benefit to me on T4 with SDIO assuming I can get the code to work on T4? or is SDIO better anyway so the optimisations are not relevant?

regards, Al.