A-119 External Input / Envelope Follower
The Doepfer A-119 External Input / Envelope Follower is designed to allow external signals to be integrated into your modular system. It comprises a pre-amp, envelope follower and comparator. The pre-amp has two inputs: an unbalanced input for line level signals, with a gain factor from 0 to 20, and a balanced input with a gain factor from 0 to 500, for insertion of low level signals, for instance from a microphone or electric guitar.
The Envelope Follower reads the signal level of the input, and puts out a proportional voltage as an envelope at it's own output.
The comparator generates a gate signal whenever the input goes about an adjustable trigger threshold.
Three LEDs help you keep track of overload, the envelope and the gate signal