Apple MainStage 3 Instruments - MainStage 3 Instruments

Use Ultrabeat oscillator 1 side chain mode
In side chain mode, Ultrabeat uses an external side-chain input as the source for oscillator 1.
The signal of any audio channel strip, bus, or live input can be routed through Ultrabeat’s filters,
envelopes, LFO, and step sequencer. Using busses as side-chain sources makes it possible to
route signals to the side-chain input from any channel strip type that offers busses as outputs
or sends. This includes software instrument channel strips, aux channel strips, or a mix of
multiple channel strips that are routed into a common aux (subgroup), that has a bus as the
output destination.
This feature enables you to use an audio input from oscillator 1, along with the synthesis engine
of oscillator 2, to create a part live audio, part synthesized drum sound, for example. As another
creative option, you could use one drum sound in a kit to filter an external audio signal with a
sequenced groove.
There are two points to note about side-chain use in Ultrabeat:
••
The side chain affects only the selected drum sound—Ultrabeat’s other drum sounds and
sequences are not altered.
••
A side-chain audio signal alone is not enough to trigger Ultrabeat. To hear the side-chained
audio signal, you need to make sure that Ultrabeat is triggered by MIDI or the internal
step sequencer.
Use Ultrabeat’s side chain
1 Turn on the side chain for oscillator 1.
2 Choose the channel strip that you want to use as the side chain input source from the Side Chain
pop-up menu at the top of the plug-in window.
3 Start playback of your audio source/host application.
4 Play a note on your MIDI keyboard (that corresponds to the side-chained drum sound).
Alternatively, you can use the step sequencer to play a pattern for the side-chained drum sound.
Chapter 14 Ultrabeat 343