From the website:
Tonelib JAM is a software for creating, editing, printing and listening to tablature and sheet music for guitar and other fretted instruments. You can use Tonelib JAM for regular guitar practicing, for learning songs or for advancing your performance skills to the next level. The Tonelib JAM makes it easy to create backing tracks from just about any song. The internal player lets you change the playback tempo while keeping the same pitch and has facilities to loop a section of the music.
It's free and it worked for me with no hassles. Seems pretty cool.