Modulation Effects - Revision history

Meambobbo at 03:10, 8 October 2015

2015-10-08T03:10:35Z

Meambobbo at 01:58, 15 July 2015

2015-07-15T01:58:16Z

Meambobbo: /* Flanger */

2015-07-15T01:56:32Z

‎Flanger

Meambobbo: /* Phaser */

2015-07-15T01:56:03Z

‎Phaser

Meambobbo at 01:55, 15 July 2015

2015-07-15T01:55:22Z

Meambobbo at 03:33, 13 April 2015

2015-04-13T03:33:56Z

Meambobbo: /* Rotary Speaker Simulator */

2015-01-21T16:45:57Z

‎Rotary Speaker Simulator

Meambobbo: /* Pre vs. Post Placement */

2015-01-21T16:41:35Z

‎Pre vs. Post Placement

Meambobbo at 17:52, 24 September 2014

2014-09-24T17:52:18Z

Meambobbo: /* Effect Types */

2014-09-24T17:15:19Z

‎Effect Types

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 Flangers often have the following controls:
 * ''Depth/Width'' - The maximum range the LFO will alter the delay time from its baseline setting.  Ex. The baseline delay is 500ms.  Depth at 100% causes the LFO to change the delay time from 0 - 1,500ms, +/-500ms from the baseline.  10% depth ranges the delay from 450 - 550ms, only 50ms from the baseline.  Note, these are hypothetical - actual values will depend on the specific device.
-* ''Rate/Speed'' - The speed at which the LFO manipulates the delay time.  Starting at the baseline delay, the LFO will lower the delay time to the min setting, then reverse and raise it to the max, then return to the baseline - that is considered one cycle.  Rate is measured in cycles per second, or Hertz (HZ).  The lower the rate, the slower the flanger's sweeping sound.
+* ''Rate/Speed'' - The speed at which the LFO manipulates the delay time.  Starting at the baseline delay, the LFO will lower the delay time to the min setting, then reverse and raise it to the max, then return to the baseline - that is considered one cycle.  Rate is measured in cycles per second, or Hertz (Hz).  The lower the rate, the slower the flanger's sweeping sound.
 * ''Feedback/Resonance/Regen'' - Allows the delayed line to feedback, enhancing the sweeping at the expense of making the tone more artificial-sounding.
 * ''Mix/Intensity'' - The proportion at which the dry (uncprocessed) signal is mixed with the delayed and feedback-adjusted signal.

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 {{Effects Crumbs|7}}
-''Modulation Effects'' cover a variety of effects that use a '''low-frequency oscillator''' (LFO) to alter the tone over time in a cyclic manner.  LFO's produce waveforms that vary over time given a number of settings such as:
+'''Modulation Effects''' refers to variety of effects that use a '''low-frequency oscillator''' (LFO) to alter the tone over time in a cyclic manner.  LFO's produce waveforms that vary over time given a number of settings such as:
 * Frequency/Rate/Time
 * Depth/Intensity/

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 === Flanger ===
-''Flangers'' provide a very similar sound to phasers, but use delay and comb filters to create the nulls.  The signal is split into 2 lines, with one line being delayed by a variable amount.  When the lines are recombined, some frequencies will be out-of-phase, creating nulls at regular intervals (a comb filter).  The delay time is linked to an LFO that changes the amount of delay cyclicly, so that the nulls sweep back and forth along the frequency spectrum.
+'''Flangers''' provide a very similar sound to phasers, but use delay and comb filters to create nulls.  The signal is split into 2 lines, with one line being delayed by a variable amount.  When the lines are recombined, some frequencies will be out-of-phase, creating nulls at regular intervals (a comb filter).  The delay time is linked to an LFO that changes the amount of delay cyclicly, so that the nulls sweep back and forth along the frequency spectrum.
 Flangers often have the following controls:

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 ==Effect Types==
 === Phaser ===
-''Phasers'' use a (often variable) number of all-pass filters (called ''stages'') to reverse the phase of certain frequencies, combining this phase-altered signal with the original signal to create nulls throughout the frequency spectrum.  An LFO modulates how the stages operate and at what frequencies the nulls occur, sweeping them back and forth.  Phasers can also use feedback on the phase-altered line to alter the make the nulls wider and less sharp.  Some additionally have a mix parameter to determine the proportion of the dry (unprocessed) signal vs. the phase-altered signal.
+'''Phasers''' use a (often variable) number of all-pass filters (called ''stages'') to reverse the phase of certain frequencies, combining this phase-altered signal with the original signal to create nulls throughout the frequency spectrum.  An LFO modulates how the stages operate and at what frequencies the nulls occur, sweeping them back and forth.  Phasers can also use feedback on the phase-altered line to alter the make the nulls wider and less sharp.  Some additionally have a mix parameter to determine the proportion of the dry (unprocessed) signal vs. the phase-altered signal.
 Popular Models:
-* MXR Phase 90
+* MXR ''Phase 90''
 === Flanger ===

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 {{Effects Crumbs|7}}
-''Modulation Effects'' cover a variety of effects that use a low-frequency oscillator (LFO) to alter the tone over time in a cyclic manner.
+''Modulation Effects'' cover a variety of effects that use a '''low-frequency oscillator''' (LFO) to alter the tone over time in a cyclic manner.  LFO's produce waveforms that vary over time given a number of settings such as:
 ==Effect Types==
 === Phaser ===

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 ''Modulation Effects'' cover a variety of effects that use a low-frequency oscillator (LFO) to alter the tone over time in a cyclic manner.
 ==Effect Types==
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 Some effects provide not only these basic effects but complex interactions between multiples of them.  Its best to become knowledgeable about how a few different models of each basic effect sound.  Then proceed to investigate the more complex options.
 [[Category: Guitar]]

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 === Rotary Speaker Simulator ===
-Many devices attempt to simulate the Leslie Rotary Speaker enclosure, which rotated a speaker on a motor to provide a shimmery sound by cyclicly slightly pitch-shifting the audible sound via the doppler effect.  While these devices commonly utilize the same techniques as phasers, flangers, chorus, or some combination of those, I want to mention them separately in case you didn't realize that.  Also, more modern simulations may be more faithful to the acoustic principles of the original Leslie.
+Many devices attempt to simulate the Leslie Rotary Speaker enclosure, which rotated a speaker on a motor to provide a shimmery sound by cyclicly slightly pitch-shifting the audible sound via the doppler effect.  While these devices commonly utilize the same techniques as phasers, flangers, chorus, or some combination of those, I want to mention them separately in case you didn't realize that.  Also, more modern simulations may be more faithful to the acoustic principles of the original Leslie, while vintage ones have their own unique charm.
 Popular Models:

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 ''Auto-Wah'' is simply wah pedal circuitry attached to an LFO, generating a constant wah-wah sweep.  It is used to get wah movement that is generally faster and more rhythmically consistent than you'd want to produce manually with a traditional wah pedal.
-== Pre vs. Post Placement ==
+== Signal Chain Placement ==
 Modulation effects do not have a typical placement like most other effects.  They are often placed before the amp (pre) as well as in the effects loop (post).

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 * MXR EVH-117
 * Electro-Harmonix PolyChorus
 === Chorus ===
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 Auto-Wah is used mostly like traditional wah - at the very front of the signal chain after the guitar.  Post configuration will sound out of control, as the wah heavily filters the entire frequency spectrum other than the resonant frequency, and the resonant frequency is in constant motion.  It is recommended to always use auto-wah in pre config.
 [[Category: Guitar]]

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 ''Phasers'' use a (often variable) number of all-pass filters (called ''stages'') to reverse the phase of certain frequencies, combining this phase-altered signal with the original signal to create nulls throughout the frequency spectrum.  An LFO modulates how the stages operate and at what frequencies the nulls occur, sweeping them back and forth.  Phasers can also use feedback on the phase-altered line to alter the make the nulls wider and less sharp.  Some additionally have a mix parameter to determine the proportion of the dry (unprocessed) signal vs. the phase-altered signal.
-==== Popular Models ====
+Popular Models:
 * MXR Phase 90
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 The most important thing to be aware of is the ''manual'' control - properly setting this parameter is crucial to getting the sound you want.
-==== Popular Models ====
+Popular Models:
 * Boss BF-2
 * Boss BF-3
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 Some choruses may combine both techniques.
-==== Popular Models ====
+Popular Models:
 * Boss CE-1
 * Boss CE-2
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 Many devices attempt to simulate the Leslie Rotary Speaker enclosure, which rotated a speaker on a motor to provide a shimmery sound by cyclicly slightly pitch-shifting the audible sound via the doppler effect.  While these devices commonly utilize the same techniques as phasers, flangers, chorus, or some combination of those, I want to mention them separately in case you didn't realize that.  Also, more modern simulations may be more faithful to the acoustic principles of the original Leslie.
-==== Popular Models ====
+Popular Models:
 * Univox Uni-vibe