Comment by eventualcomp

> In reality, you put your fingers in the position for a C on that specific instrument and you get a C.

OK, my fault for poor communication. Let me try strongly typing this.

Clarinet: you play a finger-C, out comes a soundwave-Bb. Flute: you play a finger-C, out comes a soundwave-C. And finger-C is polymorphic on the instrument, or something.

Aside from that, I don't disagree with you.

One consideration is that with most instruments, being keyed the way they are, if you immediately transpose via LLM some of those instruments will have almost all their notes in unexpected ledger lines.

Which could have (en)grave implications.