Thanks!
Small Bear:
Guitar pedals, pedal parts and electronics.
smallbear-electronics.mybigcommerce.com
I'm planning on trying a few other ICs but I haven't yet. The build docs say:
"Either use two HA1457Ws in IC1 and IC2 or use one 4558-style dual op amp in IC1-2. I recommend socketing all three so you can experiment."