notes go out of tune

I'm totally stumped by this one.

I'm running Sonar 8.5, fully updated, and using a Kurzweil K2000 as a keyboard and sound source.

In the course of putting a project together, it became obvious that a Kurzweil string patch was playing out of tune. I started wondering if this wonderful workhorse may finally be wearing out and where I could find anyone who could repair it.

But then I realized that only one clip out of the four on the String track was off key. All the others were just right.

Hopefully, I looked at the clip in Event View and Piano Roll View, but there was not a single pitch wheel event in the track. I jiggled the K2000's pitch wheel.  Nothing helped.

So then I inserted a Dimension Pro track, loaded a string patch, and copied the K2 string clip into the dimPro track. It was still out of tune. Finally, I tried re-recording the clip, and bingo, the new performance was all in tune. 

Anyone got any idea what happened?

Another question, regarding the DimPro string patches: In trying a few different patches, I found the attack of all of them was slower than I wanted. I tried patches that indicated their attacks could be changed (shortened, I assume) by mod wheel or velocity, but couldn't make any of that work. I tried moving the K2 Mod Wheel, clicking in both high and low Mod values in the track, and using both high and low velocities. I could hear no perceptible change in the attacks.

Has anyone else experienced this?

Not at all. As I mentioned, both the K200 and DimPro played that clip--and that clip only--off key. Re-recording was the solution.

I'm wondering what caused the problem.

Wouldn't any controller that got recorded show up in the Event List? I pored over that sucker like an assiduous acountant, and there was nothing there but notes.

But since it was only that one clip that had problems, it had to be something in that clip.