I've been experimenting with feedback loops for the better part of the last two years. In my band, The Common Men, I utilize feedback loops within the scope of an electric guitar. This yields some wonderfully noisy and melodically noisy passages that--in my humble opinion--make me stand out in my local scene.
I've been asked about experimenting with such techniques without having to invest in a feedback loop pedal.
Those of you interested in feedback looping can do so with your existing pedal collection and a basic mixer. The requirement is that this mixer has an FX SEND to it.
Before I continue, allow me to make this warning loud and clear:
Turn down the volume of your amplification source! Whether this is a PA or amp, make sure the volume is all the way off. Feedback looping causes sudden spikes in volume that can damage speakers--more on this later.
Let's get started!