Effects units are available in a variety of formats or "form factors".

However, he began building effects units for guitar as early as 1981.

A ring modulator is an effects unit working on this principle.

A flanger is an effects unit dedicated to creating this sound effect.

An effects unit can consist of analog or digital circuitry.

Pop this in a 2U flight case with an effects unit, and you're ready to take off in some considerable style.

A Lexicon 224 digital reverb effects unit was used on the album.

Outboard, (external effects units) can be used either during a live performance or in the recording studio.

This analog effects unit was instrumental in the production of the album, according to a May 2011 press release from the band.

According to an article in uberproaudio.com, Flea uses these effects units for his trademark sound:

Usually, however, rack-mount effects units contain several types of effects.

The 12-string guitar parts utilised a stomp box effects unit compressor.

Some touring players need several racks of effects units to reproduce on stage the sounds they have produced in the studio.

In recent (2008) concerts, all members play standing, using effects units on the floor and on tables (which they control with their hands).

Echolette was German manufacturer of electronic amplifiers and effects units.

Effects units are electronic devices that alter how a musical instrument or other audio source sounds.

Much of Hannett's studio effects units and synths are now in a private archive.

Effects units come in several formats, the most common of which are the stomp-box and the rack-mount unit.

Outboard-the number and quality of gates, compressors and effects units required.

A talk box or talkbox is an effects unit that allows musicians to modify the sound of a musical instrument.

Screaming Mad George special effects unit was commissioned to do gore effects.

Kurt Rosenwinkel simultaneously uses a wide variety of effects units, each with a very specific function and effect on the guitar's sound.

Separate expression pedals can often be added to a guitar amplifier or effects unit and used to control many different aspects of the tone.

The collection consists of nearly 150 vintage synthesizers, organs, replay instruments and electronic effects units.

A treble booster is an effects unit used by guitarists to alter the sound of their guitars.