For the adventurous, I’ve found it’s possible to turn Pure Data patches from this…
… to a plugin that you can use in Gig Performer, complete with UI and inbuilt plugin presets:
So far I’ve tried this organ instrument, and an audio effect (reverse delay). Both seem to work well.
Pure Data: http://puredata.info/downloads/pure-data
Convert to plugin using: Release v1.0.7 · pierreguillot/Camomile · GitHub