It’s not an easy issue, as every plugin use different names for “volume” controllers. Some plugins doesn’t have a “volume” LV2 controller port, but listen MIDI CC7 or CC11 for volume, CC1 for mod-wheel, etc. Anyway i’m working on a good solution, but it’s not so easy:
Currently i’ve added the possibility of specifying (hardcoded by now) a list of standard MIDI controllers for every plugin. For instance, i’ve defined such a list for MDA ePiano, MDA Piano and MDA DX10.
If you know of other plugins listening MIDI-CC , please, tell me and i will add it to the list.
I hope to improve this system by allowing to specify a “LV2-native” volume controller, or adding some heuristics for finding the right controller in the plugin’s list. Simply try to find some “standard names”: