This is great work! JUCE's licensing terms are a little confusing to me - do I correctly read that you can disregard the tier system as long as your usage complies with GPL3?
If you're looking to bring in more OSS and expand the sound synth pallet, you could bring in some of the Mutable Instruments code a la Arturia and the Microfreak. https://github.com/pichenettes/eurorack
