>There's a lot of code under the surface that you'll never know about unless you happen to need it.

Oh I'm sure - but that's not the weakness of an LLM. An LLM can handle all sorts of complicated signal processing.

It cannot reproduce the sound of a 808. And if you give it a benchmark and a candidate it cannot hear the difference in a meaningful way nor determine if it sounds "good." It cannot do it. Only a person with extensive domain experience can.