Thanks for the input. I use MainStage for live work and even tough I think it’s one of the most versatile hosts out there, I couldn’t figure out a way to do this. I use Reaktor/Csound/Max and stuff like that as well so I know a bit about using and abusing audio software, but this simple task seems to be impossible. That’s even with the new MainStage version and all the MIDI plugins.
Not only the Reaktor granular synths do that, but also Crusher X for example has a simple option next to the keyboard where you can choose if you want to save the keyboard notes with the presets or not. Granite works like that as well.