I don't think there's a magic formula for rhythm speed. It just comes with practice. Are you referring to left hand technique, such as clean and fast chord changes, or to right hand strumming speed? Either way, I can't think of specific exercises, just practice practice practice, and make sure you're playing those chords cleanly. Of course, this is coming from a guy who plays mostly rock/folk/country stuff, so what do I know about speed? But you know, sometimes when I'm just messing around, I like to play real fast, and this just happened naturally for me after playing for some years.
DC
[Edited by David C on 07-18-2002 at 01:21 PM]
"It's all right son . . . we told you what to dream"