I use X-touch one, I have connected to Fmod, and Volume Fade can also sync.
But I don’t know how to write Volume Automation at the same time during playback. I can’t find the tutorial. I have to ask.
Currently there isn’t a “write” feature for creating automation curves with an external control surface. This needs to be manually done via mouse input on the automation curve/track. It does sounds like a neat idea so I’ve added it as a feature request to our tracker.