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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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NPD] Just scored this Zappa-approved Green Ringer! : r/guitarpedals
Green Ringer in 100 Seconds - YouTube
Green Ringer Deluxe Analog Octave Up Pedal (video demo in description) | Reverb
Green Ringer - Octave UP!
Guitar FX Layouts: Dan Armstrong Green Ringer
Poulp - Green Ringer Clone
DAN ARMSTRONG™ GREEN RINGER™ REPLICA COMPLETE KIT – General Guitar Gadgets
Dan Armstrong Green Ringer on Perfboard : r/diypedals
Green ringer - SabroTone
Dan Armstrong Green Ringer Guitar Effects Pedal Green | Musician's Friend
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Green Ringer | Jeds Peds
Dan Armstrong – Green Ringer – Mu-Tron
Pedal Green Ringer de segunda mano por 80 EUR en L'Hospitalet de Llobregat en WALLAPOP
DAN ARMSTRONG: Green Ringer, Point to Point Layout (EQD Tentacle) | Armstrong, Dan, Ringer
Green ringer (clon) de segunda mano por 80 € en Barcelona | Guitarristas
File:Atmos - Green-Ringer-based octaver with extra LED clipping (2007-02-05 21.45.11 by germanium).gif - Wikimedia Commons
Pedal de timbre verde para guitarra eléctrica, amplificador de efectos para guitarra, accesorios de Bajo acústico, artesanal, modelo Octave Fuzz - AliExpress
Dan Armstrong™ Green Ringer™ | General Guitar Gadgets