On the timing, since that's not visually apparent (if I'm understanding your question), I would say No. Some will make a guess at Rit. but it usually needs adjustment.

But on the velocity, since they can read and interpret dynamic markings, ff, cresc. etc., I would say Yes. Of course, what that means is often adjustable in the notation program itself. You choose what pp means, what p means, etc. in the notation playback settings once you've imported the scan as Music XML.

Plus, the overall accuracy is much greater = fewer manual corrections needed. As my post way above stated, some read only PDFs, some read only published scores printed by Finale or Sibelius, and some can even read hand-written notation although I rarely try that. Text seems to still be weaker by comparison.

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