A question came up on the forums yesterday asking if there was a product out there that would allow you to type in a chord progression and practice over that track.
The only product that I’m aware of that fits this bill is “Band-in-a-Box” by PG Music, Inc.
I’ve tinkered around with BIAB before, but it was really my buddy Jason over at Little Rock Jams (http://www.littlerockjams.com/) who really turned me onto this. Not only does it help build your confidence with music theory and speed up the songwriting process, but also can throw down some pretty nice sounding tracks in many styles.
It’s a bit steep for the base package ($129), but you can download a demo to see if it’s what you are after before you plink down the dinero.
Dan