A sidechain compression configuration can be useful to create a ducking or pumping effect on particular audio source. The effect is usually triggered by a transient heavy track (eg. a bass drum track). This article will explain how to create such an effect in Reaper using the Native Instruments VC 160 compressor on a pad.
- In Reaper we created two tracks: The first track contains an ABSYNTH 5 bass sound. The second track contains a BATTERY 4 kit playing a kick at each quarter note of a bar.
- On the track containing ABSYNTH 5 load the VC 160 compressor as an effect plug-in. Activate the Sidechain button (below the SC Gain knob) on the plug-in interface.
- Open the Plug-in pin connector button labeled 2/4 in 2 out and enable inputs In 1 L and In 1 R for Track 1. For Track 2 enable inputs In 2 L and In 2 R.
- Open the Routing on the BATTERY 4 track by clicking the Route-button to display the Sends routing and select Absynth 5.
- Route the audio out to Channel 2 as this will be the input for the sidechain. Adjust the signal amount going to the sidechain via the volume slider.
- Now press Play in your sequencer. You should hear the Bass' volume being attenuated by the Kick track. Tweak the settings on the VC 160 to create a strong or subtle ducking effect.