This tutorial demonstrates how to link the Mixer fader controls of 3 audio clips (in this demonstration sound effects), with relative volume levels and, using Automation, adjust the overall volumes, while maintaining the relative volume levels, to match the action seen in 2 video clips.
Towards the end of the tutorial you will also find that other Mixer controls can be linked.
For using the FX channels (FX1/2) of the mixer see this tutorial.
NOTE: The linking of Mixer controls in Music Maker can also done in the same way as this tutorial.