E-Mu PROTEUS FX Manual de usuario descargar pdf (Pagina 108)

7 - Synthesizer Basics

Random Sources

108 Proteus VX Operation Manual

When the amount of an LFO is a negative value, the LFO shape will be inverted. For

example, inverting the sawtooth wave produces a wave that smoothly increases, then

instantly resets down. Since the inverted sawtooth wave is now negative, adding DC

with a cord amount of +100 will make it positive again.

Random Sources

Random modulation sources can be used when you want the timbre of the sound to be

“animated” in a random or non-consistent manner.

Key Random 1 & 2 generate different random values for each voice which are selected

at key-on time and do not change during the note.

The White & Pink Noise Generators produce varying random values. Both white and

pink noise sources are low frequency noise designed for control purposes. Either noise

source can be filtered even more by passing it through a lag processor.

The Crossfade Random function generates the same random value for all voices in a

preset. This source is designed to be used for randomly crossfading voices, although

you may find other uses.

Clock Modulation

The clock can also be used as a modulation source. It can be used to trigger the Filter or

Auxiliary envelope generators, trigger sample start, synchronize the LFOs, or used

directly as a square wave modulation source. Envelopes are triggered on the positive

going edge of the clock. LFOs are triggered on the negative going edge.

 Envelopes are

triggered on the positive

going edge of the clock.

LFOs are triggered on the

negative going edge of

the clock.

The Clock source is available in six divisions (double whole note, whole note, half

note, quarter note, eighth note, sixteenth note). The different rates can be used

separately or in conjunction to create complex “synchro-sonic” rhythm patterns.

Using MIDI clocks, the internal clock can also be synchronized with an external MIDI

device such as a drum machine or sequencer.

 The tempo of the

master clock is set from

the Multisetup page.

Clocks are routed exactly like the other modulations sources using the Cords. The Cord

Amount MUST be positive (+) for the clock to pass. By modulating the Cord Amount,

the divided clocks can be routed around using real-time controllers or other

modulation sources.

Syncing an LFO to the Clock

When an LFO is triggered by a clock, the LFO wave resets to zero every time the clock

wave goes low. To sync an LFO to the clock, patch a clock divisor to the LFO Trigger

(Trg) in the Cords screen.

If the LFO rate is close to the clock rate, the LFO will synchronize with the clock. If the

two rates are far apart, the waveform of the LFO will be mildly or radically altered (as

shown by the diagram on the following page).

The possibilities of clock modulation and retrigger are numerous. A repeating six

segment curve of any shape can be created by triggering the Filter or Auxiliary Envelope

generators with the clock. A few other possibilities are listed below.

•

Turn different voice layers on and off using different clock divisors.

• Create a global triangle LFO by routing the Clock through a Lag Processor.

• Switch between Auxiliary and Filter Envelope retriggering using a slider or

footswitch.

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