Laurence Harvey commented,
I found the answer to my own question minutes after posting: https://usermanuals.garritan.com/ARIAPlayer/Content/keyboard_and_pedals.htm It's cc#67.
Laurence Harvey created a post,
I have a variety of pedals and midi controllers, and while I can map cc#64 and get the sustain pedal to switch on and off fine using controllers, I don't know which midi code to use for the 'soft' ...