Thanks Draven. That's very interesting about the Middle-Eastern music -- I'll be looking that up. I've found that with keeping good support, it's possible to develop a very light touch, so it's just a shimmer, and I think someone would find it hard to tell it from a regular kind of fast tremelo. Also, I take your point about timing, and, because it's quite a conscious action, it's actullaly quite easy to time the oscillations with the rythmn. I find it very pleasing to use -- I feel I can really control and feel the flow of the notes in a way that I can't get with singing everything straight.