At the request of nordloef, I modded Carillon to include a waveform editor for ch3 in the ROM. To try it, download carillon-wf.zip from here. Bug reports and feature requests are accepted.

http://gbdev.gg8.se/files/musictools/Aleksi%20Eeben/

Fascinating! A good excuse to start my yearly try at Carillon.

Very nice! Thanks!