Effects units are electronic devices that affect the sound of an electric or electronic instrument or other audio source. Effects can be used in "real time", during a live performance (typically used with an electric guitar, electronic keyboard, or electric bass), or in post-production, with recorded vocals and instruments. To use an effect in a live performance, the effect is plugged in to the electrical signal path of the instrument. In a post-production setting, the source's auxiliary output is patched into the effect. Effects can also be used on other instruments or sound sources, like the Rhodes electric piano, acoustic instruments, or drums. While some effect units "color" the sound in a subtle way, others transform the sound in a dramatic fashion. An effects unit consists of analog or digital circuitry which processes audio signals. In some cases, effects processing circuitry is similar to that found in music synthesizers, as it may include active and passive filters, envelope followers or envelope modifiers, wave-shaping circuits, voltage-controlled oscillators, or digital delays.
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