A-142-4 Quad Decay

Doepfer's quad decay: four simple envelope generators whose only time parameter is the decay, each with a trigger input, a Dec. control and an envelope output.

Key features

• Four identical units: Trig input, Dec. control (about 2 ms to 2 s) and Out
• Attack set inside by a trimmer for each unit, 1 to 15 ms, about 3 ms from the factory (the TB-303's attack)
• The trigger inputs are normalled 1 to 2 to 3 to 4
• An LED shows each envelope
• A jumper per unit turns it into a self-triggering loop, like an LFO; a capacitor change moves the time range