Editing Effects unit (section)

===Built-in units===
[[File:1968 Fender Bandmaster front.jpg|thumb|left|200px|A 1968 [[Fender Bandmaster]] amplifier. Note the four inputs, two for regular sound and two which are run through the onboard [[tremolo]] effect unit.]]
Effects are often incorporated into [[instrument amplifier]]s and even some types of instruments. Electric [[guitar amplifier]]s often have built-in reverb, chorus and [[distortion]], while acoustic guitar and [[keyboard amplifier]]s tend to only have built-in reverb. Some acoustic instrument amplifiers have reverb, chorus, compression and equalization (bass and treble) effects. Vintage guitar amps typically have [[tremolo]] and [[vibrato]] effects, and sometimes reverb. The Fender Bandmaster Reverb amp, for example, had built-in reverb and vibrato. Built-in effects may offer the user less control than standalone pedals or rackmounted units. For example, on some lower- to mid-priced [[bass amplifier]]s, the only control on the [[dynamic range compression|audio compression]] effect is a button or switch to turn it on or off, or a single knob. In contrast, a pedal or rackmounted unit would typically provide ratio, threshold and attack controls or other options to allow the user additional control over the compression.

Some guitar amplifiers have built-in multi-effects units or digital [[amplifier modeling]] effects. Bass amplifiers are less likely to have built-in effects, although some may have a [[Dynamic range compression|compressor]]/[[limiter]] or [[fuzz bass]] effect.<ref>Eiche. Jon; Fliegler, Ritchie (1993) [https://books.google.com/books?id=NgG8bmBayLwC ''Amps!: The Other Half of Rock 'n' Roll''], Hal Leonard. p. 25, 40, 52, 74.</ref>{{Better source needed|reason=some of what's discussed in this paragraph was not available or common in 1993 when this ref was published|date=August 2022}}

Instruments with built-in effects include [[Hammond organ]]s, [[electronic organ]]s, [[electronic piano]]s and [[digital synthesizer]]s.<ref>{{Citation|last=Reid|first=Gordon|date=January 2004|title=Synthesizing Hammond Organ Effects: Part1|periodical=Sound on Sound|url=http://www.soundonsound.com/sos/jan04/articles/synthsecrets.htm|access-date=12 September 2010}}</ref> Built-in effects for keyboards typically include reverb, chorus and, for Hammond organ, vibrato. Many [[clonewheel organ]]s include an overdrive effect. Occasionally, acoustic-electric and electric guitars will have built-in effects, such as a preamp or equalizer.<ref>{{Citation|last=Pinksterboer|first=Hugo|title=Tipbook: Acoustic Guitar|url=https://books.google.com/books?id=xIT_PpFqz_4C|year=2001|publisher=Hal Leonard|page=51|isbn=9789076192376}}</ref><ref>{{Citation|last=Brewster|first=David M.|title=Introduction to Guitar Tone and Effects: A Manual for Getting the Sounds from Electric Guitars, Amplifiers, Effects Pedals and Processors|publisher=Hal Leonard|url=https://books.google.com/books?id=q99-bY3cL8YC|year=2003|page=7|isbn=9780634060465}}</ref>