The Step Sequencer is still fairly primitive in those kinds of things.
Sorry - it's a pain for lots of us.
Maybe if you submit a featiure request it will the one that get them to bump up priority on some of these kinds of things.
Welcome to Sonar, and to this forum. One thing that would really us to help you for any future posts, is for you to edit your forum profile, and add your system specs, like you see for sharke and for me.
What that does is it gives us an idea of what you are running things on, which may give us clues in how to better help you with issues.
Bob Bone