Logic Pro 9 Varispeed artifacts in instruments with tempo change

I must be missing something here. I've recently had Ivory and now a guitar sample which give a tape varispeed "wow" when I applied a rall in tempo change. Not everything does it, but how to avoid it?

Roger Jackson
Film Music
Oxford UK
 
I'n not hearing anything other than fake fret noise when the note is released. I imagine that is the same thing with the piano... is it a thump sound you are hearing.
 
Thanks George. Sometimes talking it through solves the problem. I checked both instances again, and realised that they both have tape delay on them. It's this that's giving (surprise surprise) the tape vari effect.

Roger Jackson
Film Music
Oxford UK
 
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