E-Mu PROTEUS FX Instrucciones de operaciones descargar pdf (Pagina 57)

PRESET PROGRAMMING

LOW FREQUENCY OSCILLATORS (LFOs)

A Low Frequency Oscillator is simply a

wave which repeats at a slow rate. Proteus

FX has two multi-wave LFOs for each of

its 32 channels. The LFO waveforms are:

Triangle, Sine, Square, Sawtooth, and

Random, which is a random “sample and

hold” type of wave.

By examining the diagram of the LFO

waveforms, you can see how the LFO will

affect a modulation destination. Suppose

we are modulating the pitch of an instru-

ment. The sine wave looks smooth, and

will smoothly change the pitch. The

square wave changes abruptly, and will

abruptly change the pitch from one pitch

to another. The sawtooth wave smoothly

decreases, then abruptly changes back up.

The sound’s pitch will follow the same

course. Controlling the pitch of an

instrument is an easy way to hear the

effects of the LFO waves.

If the key is released during the Hold (H) phase, the Release (R) phase begins.

LFO waveforms.

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E-Mu PROTEUS FX Instrucciones de operaciones Pagina 57