MCAs
Mixing Station by default allows you to use your DCAs while in sends on fader mode. This allows you to quickly change the contribution of other mixes.
What is an MCA?
An MCA is the same as a DCA but rather than controlling the signal contribution to the main mix, it changes the contribution to a bus (monitor mix).
How to use?
Enable sends on fader mode and go to your DCAs.
As you can see the fader scale changes to -15dB - +15dB
and you
can change the level of all assigned channels relatively.
Every time you enter this mode, the fader will be reset to the center, so you have the entire range to motion.