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The 1005 Modamp Module is an authentic 16HP imitation of the classic “System 2500” Ring Modulator and VCA circuit from the '70s compatible with a standard Eurorack case.
Consisting of a discrete balanced modulator and VCA, this balanced modulator device accepts two input signals (DC to 20 kHz) and produces an output that is a multiplication of the two signals creating complex waveforms with in-harmonic overtones, two precision voltage outputs control the frequency of the VCO's that are typically connected. Modulation is activated by illuminated push buttons (Mod and Unmod)
In Unmod mode the signal at input A passes to the output without any modulation and the level is set by the Unmod Gain control.
Modulation can be switched on and off by trigger or gate signals which can be patched into the module.
VCA accepts the output from the modulator and modifies the output signal level according to the sum of the Gain control and external control voltages.
Two external VCA control signals can be attenuated by front panel controls.
VCA mode can be selected as either exponential or linear.