Editing Audio signal processing (section)

===Audio effects===
{{Main|Effects unit}}
Audio effects alter the sound of a [[musical instrument]] or other audio source. Common effects include [[Distortion (music)|distortion]], often used with electric guitar in [[electric blues]] and [[rock music]]; [[Dynamics (music)|dynamic]] effects such as [[volume pedal]]s and [[Audio compressor|compressors]], which affect loudness; [[Linear filter|filters]] such as [[wah-wah pedal]]s and [[graphic equalizer]]s, which modify frequency ranges; [[modulation]] effects, such as [[Chorus effect|chorus]], [[flanger]]s and [[Phaser (effect)|phasers]]; [[Pitch (music)|pitch]] effects such as [[Pitch shifter (audio processor)|pitch shifters]]; and time effects, such as [[reverb]] and [[Delay (audio effect)|delay]], which create echoing sounds and emulate the sound of different spaces.

Musicians, [[audio engineer]]s and record producers use effects units during live performances or in the studio, typically with electric guitar, bass guitar, [[electronic keyboard]] or [[electric piano]]. While effects are most frequently used with [[Electric instrument|electric]] or [[Electronic musical instrument|electronic]] instruments, they can be used with any audio source, such as [[Acoustic music|acoustic]] instruments, drums, and vocals.<ref>{{Cite book|last1=Horne|first1=Greg|url=https://books.google.com/books?id=cHALQ_CO5P0C|title=Complete Acoustic Guitar Method: Mastering Acoustic Guitar c|publisher=Alfred Music|year=2000|isbn=9781457415043|page=92}}</ref><ref>{{Cite book|last1=Yakabuski|first1=Jim|url=https://books.google.com/books?id=QwcLdjCCXHkC|title=Professional Sound Reinforcement Techniques: Tips and Tricks of a Concert Sound Engineer|publisher=Hal Leonard|year=2001|isbn=9781931140065|page=139}}</ref>