sv-studio

I used SD card examples direct from teensyduino install. pin 10 chipselect etc I also tried to set pins 11 & 13 which actually are not needed without any success. P.S. I am going to attach usual arduino SD card module to teensy instead of audio...

I purchased 5 teensy 4.0 boards and 5 audio shields Rev D. none of them recognise SD cards, na matter what I try. it is NOT bad soldering, I am doing this stuff for more then 40 years. tried several SD cards 8 & 16 GB which work perfectly in...