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I'm working on my Ruby "201" right now specifically to fork Sonic Pi into a (literally) modular system with a (hypothetical) JIT/AOT compiled synthesis description language written in Crystal (an up and coming Ruby-like language for LLVM). I love Sam Aaron to death as he's essentially my first Ruby mentor, but I can tell his goals for the project as an educational tool are very different from my own as a glitch/breakcore/chiptune/electro-jazz performer.
It's an ambitious project but I hope to have the pieces together for Ruby to sequence a compiled synth with minimal outside dependencies within a year in order to build both the DSL for the synth and a library that will send build directives to Crystal/LLVM from Ruby and then magically connect to the resulting optimized binary in the background. I have a feeling I'll have to do the former myself, but I think when I can show a proof of concept about a live coding a compiled language, live coders and web developers who hate building between updates will see the value. I noted that Matz unveiled an MJIT in Ruby 2.6 and what he's doing here is basically the same idea with a pure Ruby twist and automatic decisions about what to compile.

Long story short... OMG that would be awesome and if there's any way I can help to enable that within the Ruby ecosystem, I certainly will. By the same token, if you have a lib out there in a Ruby-like syntax that generates a waveform with only minimal c dependencies, I'd be grateful to know about it as that would save me a lot of fundamental work and let me focus on the implementation language.

Ping @amirrajan on, he’ll get you some insider details on the synth stuff.