Quadsum expander.

Features :

• Expander module for Quadsum (for audio and CV model).
• Individual channel outputs.
• Sum CV input.
• 4-channel submix of Quadsum outputs and submix output.
• Skiff friendly : 35mm deep behind front panel (overall depth including front panel and knobs is 55mm).
• Shrouded header on the power supply connector, no risk for reverse polarity.
• Includes printed manual card and power cable.

http://www.aemit.be/quadsum.html