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Intellijel’s Quadra is an efficient quad function generator module that can be used to generate envelopes or as an LFO. Each channel can be set to its own mode: AD envelope, ASR envelope, or a cycling AD envelope that eventually loops to the point of becoming an LFO. There are switches between the Attack and Decay knobs on every channel that dictate whether the envelopes maintain a linear or exponential curve.
The unit is expandable via the Quadra Expander, which adds four EOC pulse outs, analog OR logic outs, and CV over Attack and Decay parameters.