The Passive Feedback Loop Control Tool built by Pulse Emitter from Portland, OR allows you to create a feedback loop with effects/signal processors and run a signal through them at the same time without the use of a mixer. It requires no power supply or batteries. Turns delays into howling waves of terror, distortions into nasty farting oscillators -- string up a bunch of pedals and kiss your afternoon goodbye. Amazing with modular synthesizers. The knobs are for input volume, and feedback amount. The switches are to switch on and off the input, and the feedback loop.
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