Ducking is the term we give to the process that entails one sound or event being used to attenuate (lower in gain/volume) of another sound. The common processor used for ducking is a compressor.
Ducking has been around since the advent of broadcasting. Traditionally ducking is used to manage the volume between the broadcaster and the background music. I am sure you have heard this effect before. Every time the broadcaster speaks the background music lowers in volume.
Here we are trying to duck specific frequency ranges of a mix by using a Dynamic Equaliser in Middle and Side mode. In effect we are trying to duck the sides of the audio and boost the mid.
Basically, the stereo sound is split into middle (M) and sides (S) using a process we call 'Matrixing'. Once the signal is in M/S we can treat the sides (known as the difference) and the mid (known as the sum) separately. After the processing the signal is encoded back into the standard stereo format.
In this tutorial there is a kick snare and organ sound all playing at the same time. We assign the kick to duck the mid of the organ sound and the snare to duck the sides of the organ sound.
This particular technique is a power technique. Not only can it afford us insane control over frequency ranges it also allows us to process the various mid and side elements. You can use this technique on all your mixes with like for like sounds.
Let me show you how to use the side-chain of a dynamic equaliser in conjunction with M/S (middle and sides) to duck any frequency within your mix.
Topics covered in this video are:
How to set up and use a Dynamic Eq to duck and boost the M/S of any frequency band
Learn about opposing and complimentary frequency management
Understanding where and how to incorporate M/S processing