TD-50, TD-50X: Why Does an SD Card Audio File Play Too Fast or Too Slow? August 21, 2026 02:12 Updated Follow On the TD-50 and TD-50X, an audio file plays back too fast or too slow when its sampling frequency does not match what the unit supports. Make sure the file meets the following specifications: WAV fileMP3Format (extension)WAV (.wav)MP3 (.mp3)Sampling frequency44.1 kHz44.1 kHzBit rate16, 24-bit64–320 kbps Related articles TD-50X: Setup for sending/receiving audio and MIDI via USB to the computer TD-50: How to Upgrade to the TD-50X