Using the Fruity Limiter to Set Up a Sidechaining Event
First, set up a kick drum pattern. The standard FL Studio kick loaded in a four-on-the-floor pattern (where the kick drum is triggered every beat) works well for this example. Also load up an instrument of which you want to have its volume dictated by the kick drum triggering. A continuous pad or long loop sound works best for this example, so play or program something into the piano roll that has long notes which overlap the spots where the kick drum is playing.
Next, assign your kick drum to one mixing channel and your instrument to another. Have your kick drum mixing channel (i.e. Insert 1) selected and then, right-click on the arrow icon on the bottom of your instrument channel, then select Sidechain to this channel.
After this, select the instrument mixing channel and add the plugin Fruity Limiter to it (in one of the drop-down menu's on the right). When the compressor loads up, click on Comp and in the sidechain field select your kick-drum mixing channel. Now, your instrument volume will be influenced every time the kick drum triggers, but you probably can't hear it yet.
Next, fine-tune the compression with the knobs Ratio, which controls the amount of compression applied when the threshold is exceeded and Threshold, which sets the level above which the signal is compressed. Use the visual representation of your audio signals in the Fruity Limiter as the guideline to adjust these values. Have your threshold sit just below the kick drum’s peaks for the best effect. The more you lower your threshold and the higher your ratio is set, the more pumping you will hear in your mix.
For more advanced control over your compressed signal you can also use the Att (attack) and Rel (release) knobs, where Attack influences how fast the compression kicks in when the kick is triggered and Release how long it takes before the compressed signal goes back to normal.
In order to have multiple musical elements sidechained to the kick drum you can either route each of your instruments and loops to their own mixer channel and load a Fruity Limiter on each channel for greater individual control or route your instruments to a group channel on which you place the plugin to sidechain all elements at once.