(please keep in mind that I'm an EE noob, and have tinkered only with toy uC, etc).
Is it possible that the synthesizer is using a classic USB chip (such as the "FTDI") and doing serial over USB? If that's the case, it might be substantially easier to figure out the protocol.
Thanks for the suggestion, I didn't not need to install a driver to connect the synthesizer to a computer and use the editor, so maybe that's the case. Where do you think I should get started with that, or how can I find out it that's the case? Any resources about the topic are welcome.
Is it possible that the synthesizer is using a classic USB chip (such as the "FTDI") and doing serial over USB? If that's the case, it might be substantially easier to figure out the protocol.