I've already been playing bass for years. My obsticals to learning notation are mostly timing related. I find that most notation books contain pasages to music that I dont own/can't get/ never heard of. Most of the sheet music that I can buy is guitar or piano related and the bass lines are not as the record. Ideally I would like to find a tutorial with notation with the actual recording. Even better, a software package which plays in midi and loops it until I get it right. Can anyone recomend anything?