Modulation units are the effects that modulates the original signal, affecting its tone.
On the signal chain, if we put this before the gain units we will obtain a lighter effect, whereas we can obtain one more "processed sound" putting this after the gain units.
Mono Effects
- Chorus: The Chorus adds a "copy" of the original signal with a vibrato with variable depth, remembering the sound of two guitars playing a "chorus" section.
- Flanger: The Flanger mixes the original signal with a "delayed copy" of this. This will sound like the "jet plane" effect that you should know of a lot of famous records.
- Phaser: The Phaser generates a exponential phase-cancellation, creating a "comes in and out" sound similar to the Flanger.
- Cry Baby (Wah): Famous for being used by rock and funky musicians like Jimi Hendrix, Frank Zappa, Geezer Butler, Cliff Burton, Kirk Hammet... The Wah-Wah effect modify the cut-frequency with the use of a MIDI controller (or expression pedal) in Manual Mode. If we select the Auto Mode, a LFO (Low Frequency Oscillator) will modify the cut-freq by our playing.
Stereo Effects