SONAR X3 Quicktip: Drum Replacement with ARA Integration and Addictive Drums (Producer) 
In this quicktip they lower the latency to minimum.  Why would you do this?
 
Thanks,
Ken

I'm not sure, but I've noticed that Melodyne tends to render MIDI quite late relative to the transients that it's detected. Possibly there is some tie-in with buffer size, but the error I've been seeing is far too great to be accounted for by anything like that. I haven't looked into it in enough detail to file a problem report, but it seems like a bug.
 
My immediate take is that Melodyne does a better job of converting pitch and amplitude than VVocal or Audiosnap (amplitude only), but Audiosnap does a much better job of extracting timing. So for drum replacement, which obviously doesn't require detecting pitch, I would continue to use Audiosnap.
 
 
 
 

I saw that too. I think it's for more accuracy. Like it is treating it like a live input so if your buffers are higher Melodyne will register the hits late. Like if you play your guitar with high buffers and the notes are delayed before becoming audible. It's weird because you'd figure it was an offline process and wouldn't require a consideration like that.
 
I only briefly looked at that blog entry though and really I'm just guessing so don't take my word for it. Cheers.