I first heard of this technique two years ago, but it only surfaced in my memory again when my friend, Stephen White released an experimental EP featuring this technique among others. The idea also showed up in a blog post I was reading, spurring me on to grab the Spirit Folio desk in college and have a quick go of NIMB (No Input Mixing Board) myself. I was impressed with the depth of sound you could get, particularly the buzzy saw bass I've posted below. I'd like to get further into the technique employing some guitar effects pedals etc. The Pro Tools plug ins didn't offer much flexibility for such a tactile way of making sound.
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'No Input Mixing' is a form of composition involving plugging the outputs of a mixer boards back into the inputs of it's channels and controlling the subsequent feedback for musical purposes. While this may sound like a quick route to a migraine, the results can be surprisingly pleasant when controlled by an expert such as Toshimaru Nakamuru: