Overview - Chapter 3
Pitch Effects
The Pitch effects alter the pitch of a signal in various ways to produce ÒlayeredÓ timbres that are more complex than the original signal. Although some of these effects can sound similar to one another depending on the parameter settings, each is achieved differently and can be quite dramatic under the right circumstances. Pitch effects are achieved by splitting the signal into at least two parts, effecting the pitch of one of the parts, then mixing them back together. This eventual mixing is essential since the overall sound of the effect is achieved by the actual difference between the normal, uneffected signal and the effected signal. The various types of Pitch are:
Mono Chorus
The Chorus effect is achieved by taking part of the signal, slightly delaying it, and then slightly detuning it as well. The detuning is further effected by being modulated by an LFO which causes the detuning to vary. Many parameters are available in this scheme. The Predelay can be varied, the LFO depth can be varied, the LFO speed can be varied, and a portion of the detuned signal can be fed back to the input to increase the effect. Finally, the waveform shape of the LFO can be changed from a sine wave, to a more abrupt squarewave to make the pitch detuning more pronounced.
LFO
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Stereo Chorus
In the case of a Stereo Chorus, the signal is split into three parts with a dry signal and a separate Detuning section for both left and right channels. When the left channel is detuned sharp, the right is detuned flat, and vice versa. Once again, this causes the effect to become more pronounced and dramatic. All the parameters of the Mono Chorus are also found here, although each of the two detuned signals has its own individual Predelay amount.
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Q20 Reference Manual | 39 |