Just for fun, a Mackie MS1202 feeding on itself via the two Aux outputs. 
No external sources, only reverb and delay added in post processing.

Feeding On Myself

Just for fun, no musical intent. Mackie MS1202 feeding on himself, Aux 1 goes in a cheap delay and then back to the mixer, Aux 2 goes into Logic, with simple delay and filter setup, and also back in the mixer. A function generator is used as external source. Reverb and delay added in post processing.

Feeding On Something Else

Just me on the no input mixing board (actually there is a sample player that feeds the mixer...). Only delay and reverb added in postproduction, no edits.

Delia

Experiments with a guitar, a couple of cross-feedbacked delays and a Electro Harmonix Freeze.

X-feedback

Just two mixers feeding back on themselves. Reverb and a delay added in Logic

A Song For Someone

All sounds are taken and mangled from a recording of a piano left free to regain its place in nature.

Made by me as part of a performance by Lydia White.

Ephemeral

Samples from a recording of a piano left free to regain its place in nature, and Lydia White's voice from a Skype call, all fed into a no input mixer.

Made by me as part of a performance by Lydia White.

Carlo Giacometti