> Very interesting. A possible improvement could be some "knob linkable objects" (can't imagine the correct name) that could be tied to analog inputs (GPIOs, ADC connected to i2c or USB, etc). The purpose would be to be able to modify certain parameters live on the fly, should anyone want to create a physical synth out of this software and a *PI like small SBC.

This is usually called "MIDI mapping" or similar and is available in basically every DAW these days.

> Also, I like a lot the way it links inputs and outputs just by dragging the mouse. Does anyone know if there is any general purpose library to do that? I mean, Ideally I create some list nodes, then use that library to link them in a certain order by using the mouse.

Something like qjackctl (with Jack, obviously) could do this for you, as you can route things however you want in a drag-and-drop UI.

> This is usually called "MIDI mapping" or similar and is available in basically every DAW these days.

I'm aware of MIDI mapping, my question was about the possibility to make a stand alone sysnthesizer (with keyboard and knobs) in which the necessary controls would be read from analog inputs while still displaying them on the screen as if they were changed with the mouse, which is not easy to do when playing live.

> Something like qjackctl (with Jack, obviously) could do this for you, as you can route things however you want in a drag-and-drop UI.

Sorry, my second sentence wasn't clear at all. I'd love to see a general purpose (not related to sound or any other use) library to allow the graphical representation of structures links (list nodes) together as this software and others do with generators, effects, etc. Ideally, it should operate on the header of a structure which contains the relevant fields for linking to others. When I alter the links on the screen, it does the same on the represented nodes. That would be the way I would build for example a drum machine in which each structure contains also a pattern and I can move them at will back and forth, replicate them, set their own fields (number of repeats, etc). This would be again a sound related application, but what I'm looking for is something really general purpose.

> I'm aware of MIDI mapping, my question was about the possibility to make a stand alone sysnthesizer (with keyboard and knobs) in which the necessary controls would be read from analog inputs while still displaying them on the screen as if they were changed with the mouse, which is not easy to do when playing live.

I see, I understood the opposite way! But yeah, what you are describing also exists! Many (high-end) mixers have motorized faders, also using MIDI if I remember correctly, so you can change the fader in your DAW and it's represented in meat space.

To be fair, most control surfaces and mixers these days tend to have rotary encoders, so the only thing involved in "representing in meat space" is changing the LED indicator around/near the encoder. Motors are only required for actual faders that have real linear movement.