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Chapter 14 The EVOC 20 PS 177
• When Poly is selected, the maximum number of voices is set via the numeric field
alongside the Poly button. To change the value, click and hold with your mouse, and
drag up or down to increase/decrease polyphony.
Note: Increasing the number of voices also increases processor overhead.
• When Mono or Legato is selected, the EVOC 20 PS is monophonic, and uses only one
voice.
• In Legato mode, Glide (see page 180) is only active on tied notes. Envelopes are not
retriggered when tied notes are played (single trigger).
• In Mono mode, Glide is always active and the envelopes are retriggered by every
note played (multi trigger).
• The Unison button enables/disables Unison mode. In this mode, each EVOC 20 PS
voice is doubled, which will cut polyphony in half (to a maximum of 8 voices) as
indicated by the numeric Voices field. The doubled voices are detuned by the amount
defined with the Analog parameter. (Also see the “Analog Tuning”, from page 180
onwards.)
• In Unison-Mono mode (both the Unison and Mono or Legato buttons are active), up to
16 voices can be stacked and played monophonically. In this mode, the Voices field
displays the number of stacked voices that sound at the same time.
Warning: Stacking voices in Unison-Mono mode will increase the EVOC 20 PS’s output
volume. To avoid overloading the Audio Instrument channel output, adjust the
EVOC 20 PS’s Level slider accordingly.
Oscillator Section
The EVOC 20 PS is equipped with a two oscillator digital synthesizer which features a
number of waveforms, and FM (Frequency Modulation). Further to these sound-
generators in the Synthesis section is an independent Noise generator.
There are two oscillator modes.
• Dual: Where two oscillators make use of single-cycle digital waveforms to provide
the Synthesis sound source(s).
• FM: A two operator FM engine, with Oscillator 1 as a sine wave carrier, and Oscillator
2 as the modulator. Oscillator 2 can use any of the single-cycle digital waveforms.
You can switch between Dual and FM modes by clicking on the Dual or FM label(s) to
the top left of the section shown in the diagrams.