Thanks for this information, Im using MZ-RH10. 128kbps mp3 takes too much space regarding atrac so i decided to convert them to atrac3plus and lower bitrate but then in regard of what you say the only option looks to be 64kbps. Or I have to use atrac3 which I think can not compress as well as atrac3plus... I don't really understand why the players are limited to these bitrates only...