User Manual
31
Prophet-6 Operation Manual
Low Frequency Oscillators
rOO: This is a Room reverb. It’s the second largest of the available reverbs.
Adjustable parameters are reverb time and early reection amount.
PLA: This is a Plate reverb. It emulates a classic reverb plate. Adjustable
parameters are reverb time and early reection amount.
SPr: This is a Spring reverb. It emulates a vintage, guitar-amp-style
reverb. Adjustable parameters are decay and tone.
Low Frequency Oscillators
The LFO is a special-purpose oscillator that produces a frequency below
the range of human hearing. The LFO is typically used for periodic
modulation such as vibrato (periodic pitch modulation) and tremolo
(periodic amplitude modulation).
The LFO on the Prophet-6 produces a variety of waveshapes, including
triangle, sawtooth, reverse sawtooth, square, and random. Though most
often used for low-frequency modulation, the Prophet-6 LFO can actually
function at speeds that extend into the audible range for extreme effects.
LOW FREQUENCY OSCILLATOR
FREQ 1
LFO SYNC
FREQ 2 PW 1+2 AMP FILTER
INITIAL AMT
SHAPE
FREQUENCY
The Low-Frequency Oscillator
Triangle and Random waves are bipolar. That is, their waveshape is posi-
tive for half of their cycle and negative for the other half. In the case of the
triangle wave, this 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. Random, also known as “sample and hold,” generates a series
of random values, each held for the duration of one cycle
The square wave, sawtooth, and reverse sawtooth generate only positive
values. In the case of the square wave this makes it possible to generate natural-
sounding trills.