10.6

Table Of Contents
311Logic Pro Instruments
EVOC20 PolySynth oscillator parameters
Logic Pro EVOC20 PolySynth oscillators
You can switch the EVOC20 PolySynth oscillators between dual mode and FMmode. The
Synthesis section also incorporates a noise generator that can add a further color to your
sound.
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. This leads to a number of different tones and harmonics
becoming audible. Oscillator2 can use any available digital waveform. See Frequency
modulation (FM) synthesis).
Each mode subtly changes the parameters shown in the oscillator section.
Both Dual and FMmode provide the following common parameters.
Common oscillator parameters
16’, 8, 4’ value buttons: Set 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.
Wave 1 and Wave 2 fields: Choose the waveform type for oscillators 1 and 2. There are
50 single-cycle digital waveforms with different sonic characteristics.
Logic Pro EVOC20 PolySynth oscillator dual mode
In dual mode, each oscillator can use any of 50 digital waveforms.