Hi there.
It's in the common patch parameters. You can map Velocity to:
Volume (which to all intents and purposes is the amp envelope);
The intensity of filter envelopes 1 and/or 2;
The resonance of filters 1 and/or 2;
Panorama;
FM amount;
The shape of oscillators 1 and/or 2;
And pulse width of oscillators 1 and 2 together;
^ The above are just the basic velocity modulation settings. You can have them modulate all at the same time if you want.
... However, you can use the mod-matrix (modulation matrix) to map velocity to nearly anything else. Just use "VeloOn" (velocity at key-on) as a source, and then select any destination(s) that you want to affect, and then the amount as to how much you'd like velocity to affect them.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?
A ribbon-controller or XY-Pad might be nice, too, please! Thanks!