The AVC-2D is an automatic volume controller / Limiter with 3 different modes of operation 
Features include:
 
3 modes: Stereo, mono and microphone signal monitoring.
An LCD on the front panel displays all the information regarding set-up and attenuation figures.
For added flexibility, the attack and decay times can be adjusted as well as trigger levels.
Discreet 1db steps of attenuation mean that the fading is not noticeable.