Side Chains
Each of the synth tracks and external audio inputs (represented by the MIDI tracks) can be Side Chained. Side Chains work in the same manner as in common dynamics processors such as compressors, and can be used to alter the “envelope” of synth notes in time with any of the drum tracks.
Side Chain allows the hits of the selected drum track to duck the audio level of the synths. Using synth sounds with long sustain or long Gate times, you can make a drum sample “pump” the synth sounds to produce some interesting and unusual effects.
Side Chain View is the secondary view of the FX button. Open by holding Shift and pressing FX, or press FX a second time if already in FX View to toggle the View.
Side Chain View will display either the side chain controls for the Synth tracks or the MIDI tracks (the external inputs) depending on which track was selected when Shift + FX was pressed.
The two lower rows of pads corresponds to the seven Side Chain Presets for Synth 1 and Synth 2 respectively (or MIDI 1 and MIDI 2);
The best way of understanding side chain processing is to experiment and listen.
Side Chain ducking will continue even when the level of the source track is reduced to zero in the Mixer View.