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Thanks for your reply. So as I understand it, SDFat doesn’t use extended SPI functionality but the SPI implementation means that it defaults to use pin 52 anyway. Since we are using an SD card which needs SPI and also MP3 which needs SPI, we can’t use pin 52 for the MP3 chip otherwise the SD card access and MP3 chip access would get confused. We can therefore only use pin 4 or pin 10 as the chip select pin for the MP3 chip when using the Due (if we want to use extended SPI capabilities).

Also, as I understand it the way you have modified the SFEMP3Shield software, we can only use extended SPI when using a Due.