It had like a template where you could select various instruments from like drums, bass, acoustic, electric guitar, and keyboards, along with a bunch of licks and vamps for each. You could select a key, and assign a different chord to each measure. I used to rock out to it all the time but I lost the website and cant remember it. I think it was free but if you paid for membership or something you could get more licks and stuff.

Does anyone know what I'm talking about? I'm looking for it specifically but any sites that are kind of like it would likewise be apreciated. (Don't say guitarbt.com. There's a significant difference between backing tracks and jam tracks)