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“side chain compression” technique. 
when the volume on one track is turned down to give room for another track to play. it’s popular in radio; when the dj turns down the mix to ramble on about something unimportant. that’s the most popular example, and we’ve all heard it. but it’s also used in music – electro is a good example, as well as some of the hip hop tunes created by j dilla.
so, firstly, let’s talk electro. you know how a lot of tunes in this genre have that ‘pumping’ sound to them? you hear the kick drum play out, and then you hear a synth bass that sounds like it’s getting as loud as possible. if you listen to it with headphones on, it has a jarring but igniting sound to it. how is this achieved? through the use of ducking!
when the kick plays, everything else stops (more or less) and then, after the kick has played, the synth or instrument sample is brought back from it’s silence and screams at you for a half of a second, until the next kick drum, when the process is repeated.
and now, for the producers in the room, let’s get on to the beat of this article… how can you effectively side-chain compress your beats?
i would first like to point out that it is entirely possible to do it with a regular sequencer, using the hand-drawn or hand-crafted approach, manually adjusting the volume yourself, or copying and pasting a few hand-done volume adjustments. i do that with acid pro all the time. but, i know a lot of artists would likely prefer the automatic route. there are ways to do it with ableton live, and with a lot of the other big-name daws. thankfully, we live in the era of youtube, and there are easily-searchable videos to figuring all that out, depending on what software you specifically use.
beyond that, here are some links to plug-ins that are specifically designed for sidechaining. happy ducking!

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