Synthrotek's Unity Gain Mixer is a 2-channel signal mixer that adds up to four input signals on two channels. Channel A is directly connected to channel B (normalized), so up to eight signals can be mixed and sampled as a sum signal at the lower output. If the upper output is used, the connection from channel A to channel B is interrupted and both channels are available separately.
The overall height is only rack height unit (1U), as is the installation depth. The small dimensions are currently becoming more and more popular and can be found in numerous performance-oriented Eurorack cases.
Synthrotek 1U Unity Gain Mixer EX Demo