I always duck the inputs, there is no sense in ducking outputs since the ducking signal would then duck itself, too, which makes no sense.
The Bus is needed to allow several Inputs to duck (_Not_ being ducked). Since there can be only one sidechain source for the ducker there has to be used some bus for that.
If you thought of ducking several signals instead: the right tool to achieve that is a ganging group. Both tasks can be combined, of course.
Example: think of a Show with 3 Moderators on Stage, a big Audience Hall with loud Dancefloor Music in Moderation Breaks and a separate Chillout Room with silent Background Music, where you want to have the moderation also in the Chillout Room.
So you have 5 Inputs: Moderation 1,2,3, Dance Music, Chill MusicAnd 2 Stereo Outputs: Dancefloor, Chillout Area.
To make Moderation more clear you want Duckers in both Music Input Channels that reduce Music Level on both Outpus by 12 dB when any of the Moderators speaks.
My Solution for this would be:
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create two Post Fader Stereo Aux Mixes for the Outputs. Thus, you can control Signal Levels on Main Mix for both and individually for each one on the Mix Faders. The Main MIx Output is not really needed here, since it would combine both music signals it makes no sense to use it for anything. Tha Main Mix Layer is simply used as the “Control Central” for all the signals.
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Mix the Moderation MIcs to both Output Mixes so Moderation is audible in both areas. Maybe with different levels.
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MIx the Dancefloor Music Input to the Dancefloor and the Chillout Music to the Chillout Area. Adjust the Maximum Level on the Mix Layer.
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create an additional Mono Mix and mix all Moderation Mics to that. There are arguments for pre and for post fader mixing here, i used pre Fader.
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Create a Ganging Group that couples compressor settings for both Music Channels.
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set Music Channel Compressors to Ducking Mode, activate the Sidechain and set the Mono MIx mentioned in 4) as the sidechain source.
Adjust Depth, Attack, Hold, Release and Threshold values for the Ducker to achieve reasonable results.
- If you also need some Level Control for both Zones you can do that with a DCA Group.
Of course, you cann add additional Zones to such a setup, for example one for Streaming, or having Moderation also backstage or outdoor. SQ is a nearly perfect platform for such a task. Despite the fact that it is currently not possible to assign some of the relevant ducker parameters (hold, threshold, depth, release) to rotaries which would make it a little more handy. Maybe that could be done by a future firmware release since other compressor parameters are already assignable.
It may be possible to combine that with AMM to have podium discussions with automatically ducked background music, but i never tried to figure out that because i had no need.