And I understand that. What I meant is something completely different - like a set of autocompletion rules for chords and scales, "debugging" abilities (like selectively playing particular voices or parts of song) and other stuff that makes programming... err, composing in Alda easier.

Obviously reusing some already existing text editor, like Vim, Emacs, Sublime or Atom will be the way to go when creating such "IDE". I definitely didn't mean Guitar Pro/TuxGuitar with Alda as a backend, that would be kinda pointless.