Dual Key by Flame is a performance-oriented dual envelope with the simplest of controls. Each of the envelopes is set with Time and Shape, plus three selectable speed ranges and three working modes: Shot is a normal envelope sweep. Loop mode turns the envelope into a variable waveform LFO. Gate mode holds the level after the release phase. The parameters Time and Shape can be influenced by control voltages. Each envelope outputs CV, gate and an end-of-phase trigger. Both envelopes can be triggered with the manual gate buttons, alternatively this can be done via gate from a sequencer (Key In).