BASS_BFX_PHASER Class

[SerializableAttribute]
[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public sealed class BASS_BFX_PHASER

<SerializableAttribute>
<StructLayoutAttribute(LayoutKind.Sequential, CharSet := CharSet.Ansi)>
Public NotInheritable Class BASS_BFX_PHASER

The BASS_BFX_PHASER type exposes the following members.

	Name	Description
	BASS_BFX_PHASER	Default constructor
	BASS_BFX_PHASER(Single, Single, Single, Single, Single, Single)	Constructor already setting the members
	BASS_BFX_PHASER(Single, Single, Single, Single, Single, Single, BASSFXChan)	Constructor already setting the members

	Name	Description
	Preset_BasicPhase	Sets the instance members to a preset.
	Preset_Default	Sets the instance members to a preset.
	Preset_FastPhase	Sets the instance members to a preset.
	Preset_InvertWithInvertFeedback	Sets the instance members to a preset.
	Preset_MediumPhase	Sets the instance members to a preset.
	Preset_PhaseShift	Sets the instance members to a preset.
	Preset_PhaseWithFeedback	Sets the instance members to a preset.
	Preset_SlowInvertPhaseShiftWithFeedback	Sets the instance members to a preset.
	Preset_TremoloWah	Sets the instance members to a preset.

	Name	Description
	fDryMix	Dry (unaffected) signal mix (-2...+2). Default = 0.
	fFeedback	Feedback (-1...+1). Default = 0.
	fFreq	Base frequency of sweep range (0<...1000). Default = 0.
	fRange	Sweep range inoctaves (0<...<10). Default = 0.
	fRate	Rate of sweep in cycles per second (0<...<10). Default = 0.
	fWetMix	Wet (affected) signal mix (-2...+2). Default = 0.
	lChannel	A BASSFXChan flag to define on which channels to apply the effect. Default: -1 (BASS_BFX_CHANALL) - all channels.

Phasers use an internal low frequency oscillator to automatically move notches in the frequency response up and down the frequency spectrum. An important difference between phasing and flanging is that phasers space these notches evenly across the frequency spectrum, while the notches in flanging and chorus are harmonically (musically) related. You don't hear the notches as such (because they are the frequencies that are removed). What you hear is the resulting frequency peaks between these notches. Phasing works by mixing the original signal with one that is phase shifted over the frequency spectrum. For example, a four stage phaser signal (such as this) could be from 0 degrees at 100Hz, shifted to 720 degrees at 5Khz (these extremes are not quite possible practically, but are near enough to explain the effect). This is how the term phase shifter comes about. A 4 stage phaser has 2 notches with bass response, a central peak, and treble response. By using resonance to enhance the central peak, you can get a sound similar to an automatic wah. Using a phaser with lots of stages and setting the resonance high can give a sound similar to flanging, although they are really quite different.

The fDryMix is the volume of input signal and the fWetMix is the volume of delayed signal. The fFeedback sets feedback of phaser. The fRate and fRange control how fast and far the frequency notches move. The fRate is the rate of sweep in cycles per second, fRange is the width of sweep in octaves. And the the fFreq is the base frequency of sweep.

Reference