9

Table Of Contents
Global parameters: The parameters at the top left of the interface determine the
keyboard mode and number of voices used by the EVOC 20 PolySynth. See EVOC 20
PolySynth Global Parameters.
EVOC 20 PolySynth Oscillator Parameters
The EVOC 20 PolySynth has two oscillators, which you can switch between Dual mode
and FM mode:
Click here to switch
between Dual and FM
mode.
Dual mode: Each oscillator allows you to choose a digital waveform.
FM mode: Oscillator 1 generates a sine wave. The frequency, or pitch, of Oscillator 1 is
modulated by Oscillator 2 (for information about FM synthesis, see Frequency
Modulation (FM) Synthesis). This leads to a number of different tones and harmonics
becoming audible. Oscillator 2 can use any of the digital waveforms.
Each mode subtly changes the parameters shown in the Oscillator section.
The Synthesis section also incorporates a noise generator, which can add a further color
to your sound. See the following for information on Dual mode, FM mode, and Noise
generator mode:
Dual Mode EVOC 20 PolySynth Oscillator Parameters
FM Mode EVOC 20 PolySynth Oscillator Parameters
EVOC 20 PolySynth Noise Generator Parameters
Common EVOC 20 PolySynth Oscillator Parameters
This section describes parameters common to both Dual and FM modes.
16', 8', 4' value buttons: Click to select the octave range for Oscillator 1. 16' (16 feet) is
the lowest, and 4' the highest setting. The use of the term feet to determine octaves
comes from the measurements of organ pipe lengths. The longer (and wider) the pipe,
the deeper the tone.
147Chapter 7 EVOC 20 PolySynth