How do I prepare WAV files for playback from a USB flash drive on AP-450 and AP-650?

The digital piano can play back WAV files that adhere to the following specifications:

Linear PCM, 16-bit, 44.1 kHz, Stereo

You also need to ensure that the file is named "TAKExx.WAV" (where xx is a number from 01 to 99), and that it is located within the AUDIO folder on your USB flash drive.

For more information, please refer to page E-26 of the AP-450 manual, or page 46 of the AP-650 manual.