I just found out that Paul Hindemith wrote a piece for three Trautoniums (Trautonia? Trautonium? However you would pluralize it, the video won't embed.)
Here's a wikipedia article, and here's a demonstration of the instrument:
This is a longer video with more about the instrument. It's in German, but if you click on the cc icon you can see subtitles in German, which might help. Alfred Hitchcock makes a photo appearance regarding "The Birds" at 3:50, at 4:02 we get an interview with Harald Genzmer.