Aquaboy Feedback/ oscillation/ expand stomp?

[warriorpoet]

Pardon me if this has already been asked, but is there a way to add a feedback control to the Aquaboy?

I'm looking to do something along the lines of an Endangered Audio AD4096 Expand switch, which gradually results in self-oscillation. On the EA delay it adds such a fantastic dynamic layer to the sound, I'd love to bring that to the AB.

Here's a video of the EA: https://youtu.be/yImAn0iqyVs