The Green Ringer Effect Pedal from Dan Armstrong can have a single note played into it and will produce a second tone one octave above the original note. If two notes are played into it, it will produce sum and different tones just like a ring modulator. Depending on the musical interval between the two notes, the additional tones the Green Ringer produces will be harmonically related to the original notes (such as sub octaves) or dissonant. The Ringer guitar pedal gives the musician much better control over the effect produced than a conventional ring modulator, since he is no longer playing against an arbitrary modulator frequency. It features Input Impedance of 100 k Ohms and has Output Impedance of 500 ohms, and a Signal-to-Noise ratio of 86 db.
