• The A-133 is a special dual voltage-controlled amplifier that enables both positive and negative gain. Negative gain here indicates that the input signal is inverted. The main application of the module is the processing of analog control signals, e.g. ADSR or LFO. The gain range is approximately -2.5....0....+2.5 (other gain ranges are available upon request for a small additional charge, e.g. -1...+1 or -5...+5). The gain can be adjusted manually (Man control), and by an external control input with attenuator (CV). The present gain setting is displayed with two LEDs: one for positive gain and the other for negative (so more of a gain display than a signal display, similar to the one in the A-134).