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RING MODULATION | Dan Armstrong 'The Green Ringer' VS LovePedal 'Believe' | Board Or Bin - YouTube
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File:Dan Armstrong Green Ringer circuit - an octave-up effect with a ring-modulator touch to it - just finished building (2006-03-05 22.51.45 by germanium).jpg - Wikimedia Commons
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Dan Armstrong Green Ringer - CircuitLab
Dan Armstrong™ Green Ringer™ | General Guitar Gadgets
