User Manual
28
Low Frequency Oscillators
Dave Smith Instruments
Low Frequency Oscillators
The Prophet 12 has four low frequency oscillators (LFOs) per voice. The
LFOs can be free-running, reset by keystrokes, or synced to the arpeggia-
tor and MIDI clock.
Press any of the four LFO buttons to choose an LFO for editing.
Press and briey hold any of the LFO buttons to light all the LFO buttons
and display a single parameter for all LFOs. Turning any of the four
dedicated LFO knobs—Frequency, Amount, Shape, or Destination—will
cause that parameter’s value to be displayed for each of the four LFOs.
Use the four soft knobs above the display to adjust the individual values.
Press any of the LFO buttons to return to normal editing mode.
Frequency: 0...127—Sets the frequency of LFO modulation routed to
the selected destination. See also “Sync.”
Amount: 0...127—Sets the amount of LFO modulation routed to the
selected destination.
Shape: Triangle, Reverse Sawtooth, Sawtooth, Square, Pulse 1, Pulse
2, Pulse 3, Random—The wave shape of the LFO.
Pulse 1
37.5%
SquareSawtoothReverse
Sawtooth
Triangle Pulse 2
25%
Pulse 3
12.5%
0
Random, also known as “sample and hold,” generates a series of random
values, each held for the duration of one cycle.
Triangle is bipolar. That is, it is positive for half its cycle and negative
for the other half. That makes it possible to generate a natural-sounding
vibrato that goes alternately sharp and at in equal amounts on either
side of a center frequency. The other wave shapes and Random generate
only positive values. However, any of the LFOs can be inverted using the
modulation matrix. See Modulation on page 32 for more information.