dim pro modulation

I'll assume that the source is an LFO. So click on the Pitch module and set the Pitch LFO depth to 0 -- but set the Freq, Sync, Delay to your liking. Then, open up the Mod Matrix and assign the Mod Wheel to Pitch LFO Depth -- and set the Depth and Smooth params.

It doesn't seem to be responding, but I'll play with it some more.

Some presets have the modulation 'recorded' within the multisample itself. One example would be the 'Flute V Legato' patch from 24 - Garritan Pocket Orchestra - Woodwinds. In that case, it's locked in, and you can't adjust it without substituting another multisample, or some heavy editing/re-looping inside of a wav editor.

To determine if this is the case for any given preset, click on the Load Multisamples slot, and replace the preset's multisample with anything from the 00 - Wavetables folder. If you no longer hear any modulation, then it's within the sample itself (or possibly contained within the .sfz script serving as the preset's core).