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Chapter 6 Filter 83
FM Int
This knob selects the basic waveform and controls the intensity of FM modulation.
• If set to 0, the FM tone generator is disabled, and a sawtooth wave is generated
instead.
• If set to values higher than 0, the FM tone generator is activated. Higher values result
in a more complex and brighter sound.
FM Ratio
The FM Ratio (value range 0.5 to 3.5) knob defines the ratio between the Carrier and
Modulator frequencies—the frequencies of Oscillators 1 and 2. This setting defines the
basic character of the sound.
With even-numbered values or their multiples, harmonic sounds are produced. With
odd-numbered values or their multiples, inharmonic sounds are produced, which we
perceive as being metallic sounding.
• An FM Ratio of 1.000 produces results resembling a sawtooth waveform.
• An FM Ratio of 2.000 produces results resembling a square wave with a pulse width
of 50%.
• An FM Ratio of 3.000 produces results resembling a square wave with a pulse width
of 33%.
FM Ratio is only relevant if FM Int is not set to 0.
Pitch Quantize
The Pitch Quantize, Root/Scale and Max Track controls, in conjunction with the piano
keys of the onscreen keyboard, control the automatic pitch correction facility (Pitch
Quantize) of the tracking oscillator. Pitch Quantize, in conjunction with the Root/Scale
and Max Track parameters, can be used to constrain the pitch of the tracking oscillator
to a scale or chord. This allows subtle or savage pitch corrections, and can be used
creatively on unpitched material with high harmonic content, such as cymbals and
high-hats. To use pitch quantization, the Strength parameter must be set above a value
of zero, and at least one of the onscreen keyboard keys needs to be activated.