What is the best way to change Tune (transposition/pitch) remotely?

[epietrocola]

I am running the server and would like to find a way to send a message (be it through Websocket, SocketIO or something else) so that I can set pitch (called Tune on the web interface) or completely change voice model, from an external app.

Where do you think I could add the listener to trigger these changes? Is there anything already implemented I could use? I see the SocketIO implementation but I'm not sure of what to use/send.

Any direction would be much appreciated