Rate; Depth; Feedback; Thru Zero - Alesis Wedge Reference Manual

Overview of Effects – Chapter 5
Chorus/Flange Parameters

Rate

This is the rate that the delay time is modulated. It is adjustable from 0.00 to 6.47Hz.

Depth

This controls how deep the flange or chorusing will be. It affects how wide a range of
delay time is swept, and is adjustable from 0-250.

Feedback

This is the amount of regeneration (output fed back to the input) in the
Chorus/Flanger, from -99 to 99%. Negative values produce out-of-phase feedback,
which has a thinner, hollow sound.
Rate, Depth and Feedback are always related, and you will probably find yourself
adjusting all of them at the same time. In general, slower rates sound better with high
depth settings than faster ones, and lots of feedback will sound better with lower
depth settings.

Thru Zero

This control delays the input signal to better simulate tape flanging. When flanging
was done using two tape machines, it was possible for one to be behind the other,
catch up and then go past the other. This is called passing "through zero". The "zero"
point is when both signals were in perfect synchronization.
Since the Wedge is digitally simulating the flanging effect, it normally cannot
provide the through zero effect. The "Thru0" parameter found in the Wedge's
flanging effects lets you create the appearance of the effected signal passing through
the zero point. It does this by actually delaying the uneffected signal by as much as
12 milliseconds (an amount virtually undetectable to the human ear). This allows the
wet signal to move "behind" the dry signal as it cycles. If you are using the Wedge in
a send/return arrangement with a mixer (with Dry Defeat on), there is no dry signal
to delay so you won't hear a difference in this control.

Low Pass Filter

This filter allows you to roll off any high frequencies going into the Chorus/Flanger.
This allows you to get a "warmer" flanger sound, or to simulate vintage effects.

Feedback Highpass and Lowpass Filters

These controls filter out the high and low frequencies in the feedback loop only. By
rolling off the lowest and highest frequencies, you can add lots of feedback without
getting a metallic ring or low frequency thump to the sound.

Predelay

This controls the amount of delay before the modulation effect. If you set it below
15mS, you get a Flanger. If you set it for 15 mS or more, you get a Chorus. The
Predelay range is typically up to 250mS.
Wedge Reference Manual 55