Thanks Jim. Thanks for your reply, very interesting. I tried the individual tracks as you suggested and they're a little better in terms of vibrato. I find that the demo versions I listen to are fine but the vibrato seems a lot more intense when I generate the Realtrack. I slowed the tempo of my tracks down to about 70 which seemed to slow the vibrato down but it's still not a good as the demo version. I'll continue experimenting with this and maybe provide an update if I'm successful. Can I ask what you mean by 'Direct input variation'? Thanks again.