This looks great, I'll definitely be doing some experimenting! Any way to save the output to an audio file when you're done rather than just hearing it through Alda?
This is far from ideal, but as a workaround, you could set up a sound recording program like Audacity to record system audio output and play your score.
Hopefully in the near future you'll be able to do something like "alda play --file my-score.alda --output my-file.wav" or something to that effect.