Foreword – I’m not writing this to be a butt, I want to protect anyone who isn’t super familiar with how this works and is more curious about the subject. Feel free to continue discourse and I would love to talk
With synthesizers that territory becomes a lot more grey, many digital synthesizers use copyrighted audio samples that are used as waveforms / wavetables (thus the generating tone and timbre) and therefore belong to the company who creates and sells the instrument.
It’s one thing with an old analog moog where the sawtooth oscillator is going to produce a unique and slightly different sound every time - its just produced with electrical components - and therefore its virtually impossible to make any sort of claim of ownership. But with many more modern and digital synths, its not electrically generated but electronically (digital not analog) generated – in a repeatable and consistent and copyrightable fashion.
Its sort of like how when you purchase a spitfire library, those sounds are your instrument to play with. Compose and write commercial songs with them, maybe play live, or just dabble around. But you can’t just sample those spitfire libraries and start selling them, that would be illegal as the original recordings which they have provided are specifically not for redistribution. Christian and team worked hard to make those samples for someone to make music with, not to rip off and resell without permission.
The synth world usually works the exact same way, a digital synth manufacturer works hard on getting the specific audio files for waveforms that they want, and bundle that within for the user to be able to create music with, even that which can be sold. And even though sometimes you can sell presets for those synths, usually you can’t just use those samples and resell or just give away.
A fantastic example of this is the Roland D50. It’s one of the most iconic sounding synths of all time up there with the Yamaha DX7, yet since it not only generates synthesized tones but also uses copyrighted audio clips, there are virtually no plugin recreations nor kontakt libraries of the thing out there (Except for an official one made by Roland, and an UVI clone called DS90s). Not that there haven’t been attempts, but Roland has either sued or requested cease and desist from many redistributing their material. And they have reason to, it is their work and they are still profiting from it. A lesson learned either way.