Dave Smith Instruments Prophet 12, Operation Manual

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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 arpeggiator and MIDI
clock.
Press any of the four LFO buttons to choose an LFO for editing.
Press and briefly 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%
Square Sawtooth Reverse
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 flat 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.