I've been trying to hear the playback from the samples I've recorded with my PX3B. I hear the music during the recording phase but when I let it automatically go straight into the playback phase I get zip, nada, bupkiss. Apparently, it is playing back because it displays, "Play" and the seconds numerical countdown shows on the display. I'm using a 1/4" mono adapter (Radio Shack didn't have a stereo) on the sound source end of the little cord that fits into the "AUX" input/output of the PX3B. I'd really appreciate any advice on the problem because the Phrase Trainer was one of the main reasons I bought this thing.