Octopus Manual - LinPlug Virtual Instruments

GlossaryAmplifier:Effect:Envelope:Filter:FM:Harmonic:A signal processing device that changes theamplitude, and hence the volume, of a signal.A signal processing device that changes someaspect of the input signal. An enormous number ofdifferent effect types are available. These includeChorus (which produces a thickening of the signal),Delay (adding echoes to the signal) and Distortion(which changes the shape of the waveform usuallyadding overtones).A time-varying signal used to control thedevelopment of another signal after it has beentriggered. Envelopes are most often used forcontrolling a signal's amplitude. The shape of theenvelope is determined by the number of controlparameters.A signal processing device that suppresses orfilters out specific parts of a signal's frequencyspectrum. Numerous types of filter are used inaudio synthesis. These include Low Pass, HighPass, Band Pass and Notch. The tone controls ona stereo amplifier are one example of an audiofilter.FM or Frequency Modulation is a process wherethe frequency of one oscillator (the carrier) iscontrolled by another (the modulator). When thefrequency of the modulator is periodic and belowthe audio range (less than 20 Hz) vibrato isproduced. When the modulation frequency is withinthe audio range, Frequency Modulation isproduced.A harmonic is a signal whose frequency is anintegral (whole-number) multiple of a referencefrequency. The term can also refer to the ratio ofthe frequency of such a signal to the frequency of48 Manual