Well I don't need huge amounts of distortion, but I would like to be able to get the grind that, say, Stevie Ray Vaughan gets on his 1983 perfomance on Austin City Limits. That's the sound I really like. I'm not exactly sure what amp Stevie is using on this, though (I know that he has used both fenders and marshalls).

So now my question is this - if the Roland gives me the clean sound I want, will (for example), a tube screamer give me a realistic distortion, or should I be thinking Marshalls, or Ampegs now?

I play mostly jazz, but I like to dabble into rock and blues too. The main thing I am looking for is something that is responsive to how I play, how I pick, etc...

Thanks a lot!