Dimension LE - GPO question

Hi,
 
I'm using Sonar7 PE with Dimension LE.  When using the version of GPO (Garriton Pocket Orchestra? I think it's called) that comes with Dimension LE, if I try to bend notes (using an Edirol midi keyboard pitch wheel) the note cuts off and I get a sort of static-type sound.
 
So, my questions are:

1. Is this normal?
2. Will upgrading to Dimension Pro fix this?
3. Can you bend notes on the Garriton Personal (as opposed to Pocket) Orchestra that can be purchased separately?

Thanks.