Feedback kind of "mod"?

[rudeez]

hey!
im in some serious need of help here right now.
im working on a zombie chorus, but the guy im doing it for also asked for a feedback kind of thing so when he presses a second footswitch he gets noise and such, preferable like an feedbacking amp.
i do understand tho that this cannot really be obtained but ive been looking into feedback loops, i have now made a lpb1 hooked up in a feedback loop kind of wiring, this one to be specific https://dl.dropboxusercontent.com/u/2828668/reaperpedals/..schematics/3775341040_25d6e90ca8_o.jpg
he wants a volume knob to control the amount of noise and thats it. problem is im not getting any feedback with the lpb1 in there, can you point me in the right direction here or maybe advice me on a simple distortion or such that i can build into the feedback and have a standard setting on that will create such noise?

[rousejeremy]

A chorus into a feedback loop should be giving you all sorts of chaos and noise.
http://www.youtube.com/watch?v=Je0bXVfvor4