i've just started out with reason 4 for a couple of months. Started puttin some lfo's in my basses to get a bit of a wobble goin on. When I play the track the lfo starts off in time with the bass notes, but then slowly shifts out as the tune goes on. I've got the sync button on and tried fiddlin with pretty much everythin but to no avail, does anyone know whats goin on and how i can fix it??