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I've been experimenting with controlling microphonic feedback.
First, you need to get your guitar's pickups to squeal. I use a cheap
strat for this. Then adjust volume and gain until it squeals
uncontrollably (try several distortion devices if one won't do it,
and put the pickups as close to the speaker as possible). Now to
control it you'll need a pedal. With a wah, you can play a note, and
raise the pedal to make it sustain into a squeal. I discovered this
this with a Boss flanger, set all the knobs about half-up, then make
it squeal. You should hear all these blips that rise and fall in
sequence. You can also try using the tone knobs to control the
"blips".
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