Considering that noise will be sent to the summing mixer the auxiliary buses and insert buses it can certainly add up particularly on older mixers.
Mixer channel inserts.
Mixer insert tracks audio from instruments in the channel rack should be routed to one of the insert tracks or the master.
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Inserts might be found on monoaural mixer inputs monoaural and stereo subgroups.
This switch simply turns the channel on or off.
Some digital mixers allow multiple effects to be inserted virtually still others allow multiple third party plugins to be used as virtual inserts.
For instance one could connect a gate a compressor and an equalizer in series through the same channel s insert.
Whether you are using inserts as part of your normal setup every week or just to solve an occasional routing problem they add tremendously to the versatility of your audio mixing.
On some consoles there are switches that allow you to change the eq or at least the hi and low pass filters to come before the channel.
Connected in this way you can equalize a single channel or two channels if you wish with an additional insert cable connected to the other channel of the equalizer.
If you re not using a channel keep it off so that any inherent noise is controlled.
Routing is set from the channel settings fx channel send control.
On a digital mixer you may be able to route the insert point out digitally to other points in the mixer or through the network like dante avb s link or aes 50.
If nothing is set the default destination is the master mixer track.
Eq the whole mix to equalize the whole mix everything is exactly the same as above except you should use the main insert sockets that are just to the left of the main outputs.