Hello. I have a huge sketch for a groovebox. I have a problèm writing waves samples from the sd car to the psram as soon as my pin 0 is used in my sketch. I need it to wire my midi input. Midi input is working nicely. But when i use it in the code the data don t write to psram but if i disable the serial pin 0 my data are writing nicely and i can play the samples waves from the psram. Any one already has this problem? I use the onboard sd card on teensy 4.1