The Shaped Dual EnvVCA from 4ms is a creative combination of dual VCA and envelope respectively LFO and at the same time the extended version of the Dual EnvVCA. The VCA is primarily suited for processing and modulating audio signals. The envelope is normalized to the VCA, additionally any other control voltage can be used instead of the internal modulation source. The envelope is more like a function generator, which can optionally work as an attack/(sustain)/release envelope or LFO. Additive to the time parameters, the envelope shapes can be faded continuously from exponential to linear to logarithmic. This can be done manually and via control voltage along with its own attenuator. For the Rise (Attack) and Fall (Release) times there are three speed ranges each, is eg. Fast for Fall activated, the generated voltages comfortably reach the audio range, which is perfect for AM and FM. For example, sideband modulation can be added to a single VCO but also to a complete signal path. In LFO mode (Cycle), the waveform and its speed are set with the controls. Here the module also distinguishes whether a Gate is present or not. Without Gate the circuit behaves like a free-running LFO, with Gate rise and fall are looped until Gate ends again. The two main parameters Rise and Fall have a common CV input but separate attenuators, which significantly increases the dynamics and variations of the generated voltages. Users who like to experiment will appreciate the trigger input for the cycle function, which allows the envelope to turn into an LFO for half a beat and vice versa. The Level parameter acts as an attenuator for the EG CV output (Env Out), allowing you to not only attenuate but also intervene the output voltage. Offset shifts the maximum voltage range around zero, which is very handy when you only need a certain part of a sweep. The socket or is a comparator, which compares the two envelope outputs including Level and Offset and produces a mixture of the two. The 5V Env jack bypasses the Scale and Offset controls and provides scaled voltages in the range of 0-5 volts. The Follow input acts as a slew limiter or envelope follower depending on the mode and input signal.
