Ustka

Ustka [ˈustka] is a simple passive expander module for the Ostrawa stereo mixing console. It offers direct access to four pairs of stereo signals before they are combined into the mixed signal at the output of Ostrawa. Ustka’s main application is interfacing with external multichannel devices like computer audio interfaces and hardware multitrack recorders.

http://xaocdevices.com/main/ustka/