Does the DM2000VCM have VCA groups?
You can use the fader group master feature to implement this type of capability. Under normal operation, a fader group is used to link the group’s channel faders. When you enable the fader master feature, however, the faders are no longer linked. This allows you to make adjustments to the balance within the group at any time, and to use the designated fader master to collectively control the group’s parameters.