What setup would you recommend for a serverside Synthesizer?

briefly put, I want to create a Website, that outputs an audiostream based on input given by the client in a Synthesizer-like interterface. Just so everyone accessing this site will have the exact same audiostream and state of interface, I want all the work to be done by the server and only let the client manage input. While I am not a newbie to Programming, I am a bit overwhelmed by the amount of possibilities to implement that. Can you recommend a practical setup for this, like which libraries (programming language may be tied to this) to use serverside, clientside and which technology is the most efficient way for communicating between them? I know, this isnt the quickest question to answer, but I would really appreciate your help.

PS: This project is meant to be mostly educational to me and not of any commercial use or anything