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The RM-1 for Reason is a virtual-analog ring modulator with a unique soft-saturation characteristic. Both an internal oscillator as well as mono and stereo side chains are available as a modulation source. Full CV control for all knobs is available on the backside of this rack extension.
A ring modulator multiplies a sound with a modulation signal, typically a sine wave. The result of this ranges from tremolo-type effects at low modulation frequencies to bizarre-metallic sounds at high modulation frequencies. Multiplying two signals is a trivial task in the digital domain. The RM-1, however, does not do this. Instead, it implements analog multiplication, and thus works in the same way classic analog hardware does. In an analog multiplier, the input signals interact in a highly non-linear manner. As a result, the output signal gains new harmonics not present in the inputs. The effect of this is an audible and very musical sounding saturation. Its character depends on the level of the input and modulation signal, which can be controlled using the Drive knob in the RM-1.
The unit comes with its own sine-wave modulation signal generator, which can be optionally replaced with a mono or stereo side-chain signal, allowing to multiply arbitrary signals. The AM/RM switch allows to toggle between amplitude modulation (unipolar) and ring modulation (bipolar). All parameters of the ring modulator can be modulated using the CV Inputs on the backside of the rack extension.