JuiceBox Music Player
The MP3/Photo adaptor is just a physical adaptor from the Cartridge slot] to a standard MMC/SD flash memory card. If you can't buy the adaptor, you may be able to make one following instructions here MMChack]. The JuiceBox software plays standard 128kbps MP3 files from the root directory of the flash card. Some versions of the software support other bit rates, and others refuse to play the files or have bugs.