Other FX

Other effects
Envelope follower: An envelope follower activates an effect once a designated volume is reached. One effect that uses an envelope follower is the auto-wah, which produces a "wah" effect depending on how loud or soft the notes are being played.[98][99]

A Line 6 modeling amplifier shown from above. Note the various amplifier and speaker emulations selectable via the rotary knob on the left.
Guitar amplifier modeling: Amplifier modeling is a digital effect that replicates the sound of various amplifiers, most often vintage analog "tube" amps and famous brands of speaker cabinets (e.g., the Ampeg SVT 8x10" bass cabinet). Sophisticated modeling effects can simulate different types of speaker cabinets (e.g., the sound of an 8x10" cabinet) and miking techniques. A rotary speaker simulator mimics the doppler and chorus effect sound of a vintage Leslie speaker system by replicating its volume and pitch modulations, overdrive capacity and phase shifts.[100]

Pitch correction/vocal effects: Pitch correction effects use signal-processing algorithms to re-tune faulty intonation in a vocalist's performance [101] or create unusual vocoder-type vocal effects. One of the best known examples of this is Autotune, a software program and effect unit which can be used to both correct pitch (it moves a pitch to the nearest semitone), and add vocal effects. Some stompbox-style vocal pedals contain multiple effects, such as reverb and pitch correction.

Simulators: Simulators enable electric guitars to mimic the sound of other instruments such as acoustic guitar, electric bass and sitar. Pick up simulators used on guitars with single-coil pick ups replicate the sound of guitars with humbucker pick ups, or vice versa. A de-fretter is a bass guitar effect that simulates the sound of a fretless bass. The effect uses an envelope-controlled filter and voltage-controlled amplifier to "soften" a note's attack both in volume and timbre.[102]

Bitcrusher filters: Bitcrushers rely on conversion of the audio signal into a digital format (ADC) and the reduction of sound fidelity by utilising bit (and sometimes sample rates) low enough to cause significant colouration and filtering within the audible frequency range.

A rotating Leslie speaker in a clear plastic cabinet. Typically, the Leslie is mounted in a wooden cabinet.
Rotating speakers are specially constructed amplifier/loudspeakers used to create special audio effects using the Doppler effect by rotating the speakers or a sound-directing duct. The rotating speaker creates a chorus-type effect. Named after its inventor, Donald Leslie, it is particularly associated with the Hammond organ but is used with a variety of instruments as well as vocals. The Hammond/Leslie combination has become an element in many genres of music. The Leslie Speaker and the Hammond Organ brands are currently owned by Suzuki Musical Instrument Corporation. The stompbox that simulates this effect is the Uni-Vibe pedal.

The Korg Kaoss Pad is a small touchpad MIDI controller, sampler, and effects processor for audio and musical instruments, made by Korg. The Kaoss Pad's touchpad can be used to control its internal effects engine, which can be applied to a line-in signal or to samples recorded from the line-in. Effects types include pitch shifting, distortion, filtering, wah-wah, tremolo, flanging, delay, reverberation, auto-panning, gating, phasing, and ring modulation. The Kaoss Pad can also be used as a MIDI controller.