DESCRIPTION:
http://www.synthrotek.com/products/mst-eurorack-modules/mst-4-channel-audio-cv-mixer/
The MST Audio/CV 4-Channel Mixer is a mixer and/or attenuator with mute switches per channel – A must for the performing modular artist!

Features:

1 on/off (mute) switch per channel

Jumper select ~unity gain or ~2x gain amplification

Attenuator per channel

Master output attenuator

Normal- in-phase output & Inverted, reverse-phase output

Green +5V LED indicates “Optimal” level output

Red “Clip” LED indicates ~8V to rail

Specifications:

Current draw: V+ max 13.25mA, V- max 7.35mA

Width: 8HP, Depth: 3.5 cm (1.88 in)