Attenuator and Mixer
4ATTMIX FADER is functionally identical with the 4ATTMIX module, but instead of potentiometers there are faders which are convenient in certain situations where values are to be changed simultaneously, It is also easier to see the current levels at a glance, excellent for VCO mixing.
These merchants probably sell this module. Huh?
Tangible Waves 4ATTMIX FADER