I asked before buying if it could play multiple sounds simultaneously. Obviously he didn't read my message, because he said it would work fine for that in his message. Upset after spending much time and money to build a device around this module. I should have just bought Teensy Audio for my project. The manual is decent, I've read it several times. Shipping is overpriced.
Response from Senior Electron LLC | July 9, 2020
Dear Customer, We never claimed it can play multiple files at the same time !. The module can only play or record one file at a time.