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    AudioPlaySdWav DMA timing and buffer misalignment issues

    Summary: To get the example code to play a WAV file from the built-in SD card on a Teensy 3.5, I had to make two changes: 1. A short delay was needed between the __disable_irq() and SD.open() calls in AudioPlaySdWav::play(). This prevented the Teensy from getting stuck indefinitely waiting...
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