Envelopes - including ADSR envelopes - are important building block of sound synthesis. If your favorite instrument or effect doesn’t have enough, an external envelope generator is always handy.
But CV Response offers a little bit more. Each of the four envelope stages has an end trigger output and a stage gate CV output. So this device can trigger/drive other devices depending on the current state.
With the touchscreen friendly ribbon you can fire the envelope with a velocity based on distance from either edge. This can also be recorded to the Reason Sequencer.