The Disquiet Junto project this week is to "Use the Shepard tone to create a piece of music."
I found a MIDI file that purported to give a Shepard tone, although it didn't sound as convincing as Hans Zimmer.
To give the tones some shape I forced them into a scale using one of Live's MIDI effects.
Then I tried a few different instruments, until it started to hold my interest.
