Sequential Prophet Rev 2, User Manual

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32 33 Low Frequency Oscillators Sequential Prophet Rev2 User’s Guide Modulation
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.
Square Random Sawtooth Reverse
Sawtooth
Triangle
0
LFO waveshapes
The LFOs can be free-running or synced to the arpeggiator, sequencer, or
MIDI clock for tempo-synced effects such as filter sweeps, tremolo, and so on.
Shape: Triangle, Sawtooth, Reverse Sawtooth, Square, Random
—This
button sets the waveshape of the selected LFO.
Frequency:
Sets the frequency of the selected LFO from a slow .022Hz
to a fast 500Hz. This is affected by the
clk sync
(clock sync) parameter
as explained below.
Clk Sync:
When on, the LFO synchronizes with the master clock, which
controls the arpeggiator, sequencer, and certain effects.
Destination:
Routes the selected LFO to one of the many modulatable
destinations within the synthesizer. You can also use the modulation
matrix to route an LFO to additional destinations.
Amount:
Sets the amount of LFO modulation routed to the selected
destination. Setting an amount here applies the selected modulation
continuously. You can also use the modulation matrix to route an LFO
to additional destinations and use a different modulation amount if you
want.
Key Sync:
When enabled, this makes the LFO wave cycle reset when you
press a key (but is not reset if you press a key while other notes are held).
There is a shortcut for routing an LFO to a front-panel destination (provided
that the destination is a valid destination). Simply hold down the selector button of the
desired LFO, then and move the knob or control you want to use as a destination (the
filter cutoff, for example). Set the amount using the LFO
amount
knobs. Be aware that
not all front-panel controls can be used as a modulation destinations.
Modulation
Although the overall sonic character of the Prophet Rev2 is deter-
mined by its analog oscillators and filters, much of its power to make
truly unique and unusual sounds comes from creative use of modula-
tion. Modulation is the process of routing one parameter (i.e. a control
voltage) to another in order to change the way the targeted parameter
behaves.
The concept is simple:
1. Choose a source.
2. Choose a destination.
3. Set an amount. The amount can either be positive or negative.
You already understand and apply the concept of modulation whenever
you use the filter envelope to control the filter’s cutoff frequency. In this
case, the modulation source is the filter envelope (or more precisely, any
of its controls, such as attack, decay, sustain, or release). The modulation
destination
, is the filter’s cutoff frequency. The modulation
amount
is set
with the
env amount
knob.
There are twenty-two different modulation sources and fifty-three differ-
ent destinations to choose from. (See page 73 for a complete list.)
There are 8 freely assignable modulation paths (mod slots 1-8) as well as
5 additional dedicated mod sources: Mod Wheel, Pressure (aftertouch),
Breath Controller, Velocity, and MIDI Footswitch. This gives you a large
number of sound-shaping options.
SOURCE
DESTINATION
MODULATION
SELECT
AMOUNT
The Modulation section