This is one area where Eurorack modules are not so advanced, but the new Mixer from Toppobrillo aims to change that:

Its a  voltage controlled stereo mixer with 4 channels,Voltage controlled panning, mute / solo (mutes with VC control in future). One aux send with stereo return.  LED VU-meter and pre-master fader headphone amp.

Available soon, price to be set.

Toppobrillo.com

NAMM 2016 Kit:
Tascam DR-70D 4 Channel recorders