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14 The EVOC 20 PS
The EVOC 20 PS combines a vocoder with a polyphonic
synthesizer, and can be played in real-time. This chapter
explains the use of the EVOC 20 TO and its parameters.
The EVOC 20 PS is a sophisticated vocoder, equipped with a polyphonic synthesis
engine, and capable of receiving MIDI note input. This allows the EVOC 20 PS to be
played, resulting in classic vocoder choir sounds, for example. Single notes and chords
played with the polyphonic EVOC 20 PS will sing with the articulation of the Analysis
audio source. During this process, the sonic characteristics and changes of the audio
signal arriving at the Analysis input (the audio track selected as a side chain) are
imposed onto the output signal of the integrated synthesizer (the Synthesis section).
The signal path of the EVOC 20 PS is shown in the block diagram on page 190.
Using the EVOC 20 PS
To make use of the EVOC 20 PS, you need to insert the EVOC 20 PS into an Audio
Instrument channel instrument slot, and you also need to provide an audio signal as
the Analysis audio source.
You can do this by following these steps.
1 Select or create a new audio track in the Arrange window.
2 Insert (or record) an audio file—we’ll use a vocal part to start with—onto this audio
track by Shift-clicking onto the Arrange area with the Pencil tool. This will launch a file
browser, allowing you to select the desired audio file.
3 Click once on the name of the audio file you wish to use, and press Open. The file will
be inserted at the selected location. It may be worthwhile setting up a cycle region in
the Arrange window, allowing you to continually cycle the audio part. This will make
experimentation easier.
4 Insert the EVOC 20 PS into the Instrument slot of an Audio Instrument channel.
5 In the gray area at the top of the Plug-in window, click-hold on the Side Chain pull-
down menu, and select the audio track that contains the audio file.