Sunday Synth Jam: This video captures a performance of an original composition by David Gerhard, using the Rainboard.
The Rainboard is a DIY dynamic isomorphic keyboard. One of the key features of isomorphic keyboard layouts is that intervals are played consistently across the entire keyboard.
The Rainboard can interface the Musix iOS app in order to change layouts and adjust settings. It can also be played on its own after a layout is set.
More details can be found at rainboard.shiverware.com.