Rikki, samplers like kontakt respond to velocity and aftertouch. In fact, you can assign any number of effects to aftertouch, e.g., note bending, notch filters, etc. Samplers like kontakt can do anything keyboards can and more.

Soundfonts would repond to aftertouch (I think) provided the sampler you are using has this feature. LiveSynth Pro may not have this feature.

[This message has been edited by Frank L. Rosenthal (edited 11-15-2005).]