This is fun. Got really close to finishing 9 before giving up. Being able to delete links independently of nodes would help a lot. Another UI suggestion: allow us to hold a mouse/keyboard button to temporarily treat the node under the cursor as if it were sending to debug (so you can almost-instantly visualise some subgraph’s effect).
Also, this would be fantastic with an audio representation of the waveform! As always, anything that can put out very annoying pure sine waves needs a volume control, but it would be very neat for people new to audio synthesis to be able to learn what these waveforms actually sound like. A nice default would be to create a brief, softly-decaying pulse of sound across 1-2 seconds each time the waveform changes as a result of user input.