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.
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.