Hi. I've just started using GPO (with Kontakt Player 2) in Logic Pro 8. I'm a bit confused as to how the program handles volume (which I understand is controlled by the mod wheel)

My tracks contain modulation data, and these data seem to reset the positions of the sliders in the LP8 mixer, especially at the beginning of the piece!

Okay here's my question... are the sliders in Logic controlling modulation? Or are they controlling volume (in the conventional sense)? How does this work exactly?