Mike,
It's fairly straightforward and pretty easy to use. I have used it with very good results in the past, but I stick with Sonar 3 or FL studio when I am going to use softsynths. A couple of the vsti's I have occasionally crash SQ01, but not my other sequencers.
BTW, the SQ01 came on a CD when I purchased my ES. I don't know of any place to d/l it. You might inquire at Motifator.
AJ
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AJ