SampleTank Sax Question

[anzoid]

I was advised by DarkStar to post this here to see if you can help with a SampleTank question.

I'm using SampleTank 2.5 with the 2.1 sounds. I've loaded the "Expression Tenor Sax". When I use Pitch Bend the volume of the instrument goes up (and down...) but the pitch doesn't change.

I can assign a pitch change to the pitch bend wheel without difficulty but I still get the volume increase and decrease at the same time. I've been through all the options but can't see an obvious way of changing this.

Is it possible? Thanks