I have a like new. Tascam bt2. It is basically a tool used to slow down cd's so that you can practice and learn bass lines, or any song parts for that matter. I never used it much. It also has the AC adapter that I bought after. They go for about $100 new or $50 used on sites. $35 shipped conus. Info from the site: The new CD-BT2 bass trainer features an all new improved ultra compact design, comprehensive LCD display with graphical user interface, Album title/Track title indication by CD-Text, expanded effect banks for user preset, chromatic tuner, and TASCAM'S pioneering VSA (Variable Speed Audition, pitch control without affecting key) feature lets music fans learn up a continuous mix of their favorite songs anywhere they go. With TASCAM'S legendary ease of use, pioneering features such as integrated pitch and key control, bass canceller with selectable canceling pan point and selectable frequency range, and seamless integration with CD-DA/CD-R/CD-RW disc playback. Users can now discover the licks their favorite artist really played.