9.0

Included VST Instruments
Prologue
OSC 3 Parameters
Osc 3 (0–100)
Controls the output level of the oscillator.
Coarse (±48semitones)
Determines the coarse pitch for Osc 3. If FM is activated, this determines the
frequency ratio of the oscillator regarding Osc 1/2.
Fine (±50 cent)
Fine-tunes the oscillator pitch in cent increments. If FM is activated, this
determines the frequency ratio of the oscillator regarding Osc 1/2.
Ratio (1–16)
This parameter is only active if the Freq Mod button is activated. It adjusts the
amount of frequency modulation applied to oscillator 3. It is normally referred to
as “FM index”.
Sync button (On/Off)
If Sync is activated, Osc 3 is slaved to Osc 1. This means that every time Osc 1
completes its cycle, Osc 3 is forced to start its cycle from the beginning. This
produces a characteristic sound, suitable for lead playing. Osc 1 determines the
pitch, and varying the pitch of Osc 3 produces changes in timbre. For classic sync
sounds, try modulating the pitch of Osc 3 with an envelope or an LFO. The Osc 3
pitch should also be set higher than the pitch of Osc1.
Tracking button (On/Off)
If Tracking is activated, the oscillator pitch tracks the notes played on the
keyboard. If Tracking is deactivated, the oscillator pitch remains constant,
regardless of the note that is played.
Freq Mod button (On/Off)
Activates/Deactivates frequency modulation.
Wave Mod button (On/Off)
Activates/Deactivates wave modulation.
Waveform pop-up menu
Sets the basic waveform for the oscillator.
About Frequency Modulation
Frequency modulation or FM means that the frequency of one oscillator, called the carrier, is
modulated by the frequency of another oscillator, called the modulator.
• In Prologue, Osc 1 is the modulator, and Osc 2 and 3 are carriers.
However, Osc 2 can be both carrier and modulator as if frequency modulation is
applied to Osc 2 it is modulated by Osc 3. If Osc 2 also uses frequency modulation, Osc
3 is modulated by both Osc 1 and Osc 2.
• The pure sound of frequency modulation is output through the modulator oscillators.
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