Hi!
  So I’m running 2 instances with different vsti(one is piano one is guitar) in it. the following case applies to both automatic compensated DAW & no-compensated DAW (automatic compensated DAW is better is this case but still have the timing difference issues):
  The timing difference between the very wav staring point of the recorded 2 sound(piano and guitar) is 20 sample, then I do another pass, the difference is 10, then I do another pass, the difference is 56.. So the difference is never the same.  
  Turn on delay compensation helps, but still there is difference. 
   For the ones without delay compensation, I can undersatnd that there's latency, but shouldn't each pass the latency is the same? Why running the same virtual instruments (I picked those which does not have round robin) in VE pro instance produces different latency each time?

Thanks