FXAlgs #150Ð153: Choruses
Algorithm Reference-55
Tap Lvl
Levels of the LFO-modulated delay taps. Negative values polarity-invert the signal.
Setting any tap level to 0% effectively turns off the delay tap. Since these controls allow
the full input level to pass through all the delay taps, a 100% setting on all the summed
taps will signiÞcantly boost the wet signal relative to dry. A 50% setting may be more
reasonable.
Tap Pan
The left or right output panning of the delay taps. The range is -100% for fully left to
100% for fully right. Setting the pan to 0% sends equal amounts to both left and right
channels for center or mono panning. [Dual Chorus 1 & 2 only]
LFO Rate
Used to set the speeds of modulation of the delay lines. Low rates increase LFO
excursion (see LFO Dpth below). If Pitch Env is set to ÒtrapzoidÓ, you will be unable to
put the rate on an FXMod or otherwise change the rate without introducing
discontinuities (glitches or zippering) to your output signal. The triangular ÒTriangleÓ
Pitch Env setting does allow smooth rate modulation, provided youÕve speciÞed enough
delay.
LFO Depth
The maximum depth of detuning of the LFO-modulated delay lines. The range is 0 to 50
cents, with a cent equal to 1/100th of a semitone. If you do not have enough delay
speciÞed with Tap Dly to get the depth youÕve dialed up, then Tap Dly will be forced to
increase, which can cause discontinuities if signal is present. The LFOs move a tap back
and forth across the delay lines to shift the pitch of the tapped signal. The maximum
distance the taps get moved from the center position of the LFO is called the LFO
excursion. Excursion is calculated from both the LFO depth and rate settings. Large
depths and low rates produce large excursions. If Pitch Env is set to ÒtrapzoidÓ, you will
be unable to put the depth on an FXMod or otherwise change the depth without
introducing discontinuities (glitches or zippering) to your output signal. The triangular
ÒTriangleÓ Pitch Env setting does allow smooth depth modulation, provided youÕve
speciÞed enough delay.
Tap Dly
The average delay length, or the delay to the center of the LFO sweep. If the delay is
shorter than the LFO excursion, then the Tap Dly will be forced to a longer length, equal
to the amount of required excursion (the parameter display will not change though).
Changing this parameter while signal is present will cause signal discontinuities. ItÕs
best to set and forget this one. Set it long enough so that there are no discontinuities with
the largest Depth and lowest Rates that you will be using.
L/R Phase or LFO
n
LRPhs
In Chorus 1 and Chorus 2, the relative phases of the LFOs for the left and right
channels may be adjusted.
