Channel Linking for Multi-Mono Mode

[apohl79]

Ultimately it would be as follows:

• Next to the A/B and "power" button there should be a small "Link All" button (might be represented with a "chain" symbol), when pressed all multi-mono instances get dialed in the same settings when editing a setting.
• When this "Link All" button is activated, all channels in the channel selector (currently next to the power button) should have a "tick" next to the corresponding channel which is activated. Natively all channels have to be linked when the Link All button has been pressed.
• A multi-mono instance should also be able to be unlinked (let's say LFE in multichannel mixes). An additional button "Unlink Instance" (might be represented with a "broken chain" symbol) could make this happen. When this Unlink Instance button has been pressed, the "tick" in the channel list disappears.