Thank you Scott for responding so quickly. I discovered the problem after I submitted the post. I was naming the file "TAK01.WAV" and Windows 7 was automatically adding the extension "wav" resulting in the file name: "TAKE01.WAV.wav", unrecognizable by the PX-350. I renamed the file simply "TAKE01" and the file loaded and played successfully. The problem I have now is the relative volume of the song to that of the keyboard. Is there an easy way to adjust the song's volume?