Sigma Studio sidechain?

Thank you so much for your reply. Kind of volume control but more like as one channel goes up another goes a little down. this is what I'm thinking:
It's a 4ch amp: channel 1 and 2 are stereo high frequency, 3 and 4 are bridged mono for low frequency.
At the moment it works great but when playing music at low volume the low frequencies are to soft OR when I turn up the master the low frequency channel 3 and 4 are to loud.

What I need is when I turn down the volume on all channels (master volume) I need channel 3 and 4 to get louder to a set point. and the opposite like when I turn up the master volume I need channel 3 and 4 to get softer to a point.
I'm sure it's doable but just need a head start.
Thanks heaps 🙂
 
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