I exchanged with Saul, the site admin, who thought this could be of interest to the forum members.
I'm the (hobbyist) developer of JJazzLab, a brand new desktop application targeted to musicians who practice their instrument with backing tracks.
JJazzLab comes with some unique features compared to similar apps like Band In A Box:
- Dynamic backing tracks: you can start a solo slowly and build up the atmosphere
- Rhythmic accents support
- Support of Yamaha styles, plus a new extended YamJJazz style format for more variations
- The infrastructure is released as an open-source framework: JJazzLab-X
Feedback welcome !