I just picked up a Tosh 4700 and went through the many different problems discs I have. Although it played the DVD-R I had created well except to get the PCM audio I had to select PCM audio output. This seemed strange to me because mp3's play in bitstream mode, why not this DVD-R? This may be something I did, but the RP-56 plays it correctly. What I've noticed is the audio seems to fade in and out on each channel. There is not good audio reproduction. There are even some tracks that just output the awful screaching undecoded data. My girlfriend freaked out when this happened the first time. VBR joined and not-joined mp3's seem to play the same with the fade in/out problem. I know the MP3 problems I am experiencing may be due to the recording process. I'll try some other burns on Monday at work. Has anyone else experienced any problems with mp3s?