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The Vib low frequency oscillator (LFO) is used to periodically vary only the pitch of the waveform to produce vibrato and tremolo. Effective use of the LFO provides an extra dimension of interest to what is otherwise a constant tone.
The following settings are available in the Instrument Articulation area of the DLS Designer Window when the Vib LFO button is selected:
Cycles per second at which you want the pitch and/or amplitude to modulate.
Length of time to pass before modulation begins.
Degree to which the frequency of the wave is modulated.
Effect of channel pressure on pitch.
Effect of mod wheel on pitch. The value set by the MW to Pitch slider indicates the MIDI mod wheel message to translate to vibrato, using the values for Frequency and Delay. If you set this value to zero, MIDI mod wheel messages do not generate vibrato.