Module A-119 (External Input / Envelope Follower) is designed to allow external audio signals to be integrated into the System A-100. 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 of from 0 to 20, and a balanced input with a gain factor of 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 its own output. 

The comparator generates a gate signal whenever the input goes above an adjustable trigger threshold. 

Three LEDs help you keep track of overload, the envelope, and the gate signal.

technical details

Width: 8HP 

Connections: 
Symm. Audio input (6,3 mm) 
Asym. Audio input (3,5 mm) 
2x Audio output (parallel) 
Envelope output 
Gate output