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"The R-55 is essentially one of the VCOs in the legendary S-1000 Wretch Machine in a 22U Eurorack module. It produces the notorious “sharkfin” sawtooth waveform of thyratron VCOs, replete with the weird pitch variations and apparent “noisiness” of a thyratron oscillator. Turn up the overdrive control, and the oscillator output clips the output amplifier pentode tube, for a unique soft-clipped square-wave sound. The simplicity of the R-55 will fool you--its behavior is erratic and weird, it always sounds “broken”, and the waveform is “deviated” in every way. You don't even need to feed it Hz/v CV: just run a square-wave or pulse signal from a conventional VCO into a pitch CV input, and it will “force” the R-55 to track along with the other VCO. CV response: Hz/v, giving about 1.5 octaves of usable range with a Kenton Pro-Solo MIDI/CV. Span and offset trimpots on front panel, adjustable to make the R-55 track roughly along with the Metasonix R-54 Supermodule, or with other Hz/v VCOs. Maximum pitch range, 60 Hz to more than 3 kHz (approximate), range with CV typ. 2.5 octaves maximum. Octave switch raises pitch range about 2 octaves..."
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