The Quasimidi Rave-O-Lution 309 is one of the synths we're considering adding support for in Patch Base.
If you want to see an editor for this synth, give us your feedback on the Patch Base Voting page, to let us know!
Download Patch Base for iPad free in the App Store.
Patch Base runs on macOS 10.13 and higher. Download it here.