DigiTech JamMan Stereo
JamMan Stereo supports over 6 hours worth of material could be stored on a removable media card to store 35 minutes of CD-quality loops in 99 internal memories as well as having an SD memory card expansion slot giving you the ability to store over 16 hours of material in an additional 99 slots.

The JamMan Stereo also features true stereo looping, reverse playback, and a mic input making it perfect for backing tracks