Hours of custom music mixes downloaded from the Net. Playback through a device small enough to fit in the palm of your hand, with no moving parts never a skip or hiccup. An MP3 changer is a natural for car audio. Now its here: Rockford Fosgates RFXMP3.8, honored with a prestigious Innovations 2000 Award for product design at this years Consumer Electronics Show. MP3 (MPEG-1 Audio Layer 3) music "files" are downloaded from the Internet (or "ripped" from your own CDs) and then stored in your computer. You can transfer these music files (using the included docking station) to tiny memory cards (about the size of a postage stamp). The RFXMP3.8 holds up to 8 individual multi-media (MMC) cards providing hours of music. You can expect the supplied 8 MB Multi Media Card to hold up to 1/2 hour of music, depending on the sound quality (i.e., amount of compression) of the recording. Optional cards with larger capacity can hold up to 1-1/2 hours of near CD-quality sound (up to 4 hours of near FM-quality sound). Any com