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Quad Attenuator / Rectifier
The ATT-4 consists of four independent manual attenuators and it is ideal as interface between modulation sources and modules with direct CV inputs (not attenuable CV inputs). It has additionally LEVEL/BIAS SHIFTERS which converts nominal signals ±5 Volts (such as VCO-2RM or D-LFO outputs) to a positive signal (0 to 5 Volts) for controlling of parameters, such as level, Q-peak and other with the controlling voltage range of 0 to 5 Volts.
The LEVEL controls the outgoing signals amplitude from 0 to the maximal level.
Later versions have arrows on the panel between each of the inputs, indicating cascading normalization between inputs.
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These merchants probably sell this module. Huh?