Automation

Does GP have automation features for volume fade-out and cross-fading between two or more audio files, filter cutoff automation, expression, velocity, modulation, panning, and possibly specific plug-in parameter automation?

Would be very handy tools to have for live use if you could pre-program these things with a trigger.

Any help and tips to point me in the right direction would be greatly appreciated.

You can use scripting to Control your Widgets.
But there Are some Plugins you could use
For example midishaper
https://www.cableguys.com/products.html