Steamboat Ed's calliope

Steamboat Ed left this comment on my post about my vocoder project:

Ha! Interesting timing! Got a Stamp-controlled mini calliope working today; only took a year to get the bugs out, hehe. I suspect it'll take another year to make it as elegant as your slide whistle tho... ;-)

Below is his calliope project... I like his use of sprinkler parts for controlling airflow.