Audio Effects
Amplify
Changes volume or loudness.
Chorus
An effect in which multiple copies of a signal are played together slightly off time from each other.
Compressor
Reduces the dynamic range of a signal, making loud sounds quieter and the quiet sounds louder.
Crossfade
Fades out one sound while fading in another.
Delay
An effect in which a copy of a signal is played back later than the original.
Dopler
Dynamically changes a pitch.
Dynamics
Volume changes in audio.
Echo
A delay-based effect where copies of a signal are introduced then trail off to silence.
Expander
Reduces the level of a signal when it falls below a set threshold in order to overemphasize its dynamic range.
Fade In/Out
Changes level over time increasing/decreasing in amplitude from/to silence.
Feedback
Delayed repeated signal that produces multiples of the original signal. Or, a loud squeal created when a channel is receiving its own output.
Flange
Generates a swirling sound by adding a slightly delayed copy of a signal in which the delay time fluctuates.
Harmonizer
Can add odd and even multiples of a fundamental frequency to provide a characteristic (or timbre) to give each instrument or voice a unique sound.
Invert
Changes positive offset to negative and vice versa.
Interpolate
Smoothes out the waveform between start and finish markers, often used to remove a pop or click.
Mechanize
Adds a robotic or mechanical characteristic.
Modulate
An electronic process, in which one source modifies the characteristics of another signal source.
Noise
Adds a noise to a selected location, often a Gaussian or White noise.
Normalize
Process by which the gain of digital audio is increased to its maximum volume.
Off Set
Adjusts or removes a dc offset in a selection by shifting the waveform up or down.
Pan
Adjusts the left/right positioning of a signal within a stereo mix.
Phaser
An effect, which is a modified flange that adds a swirling sound to a signal.
Pitch
Changes the frequency of the selected part of an audio file, increases or decreases timbre
Reduce Vocals
May reduce vocals from certain stereo recording by subtracting the left and right channels or by using a bandstop filter.
Resample
Takes a single parameter "sample rate" and recalculates existing audio data using the new sample rate.
Reverb
An effect in which the ambience of a physical space is simulated, this is achieved by copying a signal many times and repeating it at decreasing levels at intervals so close together that they are heard like one sound.
Reverse
Plays the audio backwards.
Silence
Can insert silence at a selected portion of the audio.
Stretch
Changes the frequency, duration and pitch of a selected part of the audio
Time Warp (stretch)
Changes the playback speed or stretches/compresses the length of the selection
Trim
Removes sounds outside of the selected part of audio.
Vibrato
A rhythmic fluctuation in pitch.
Filters
Band Pass
Allows only the band of frequencies surrounding the cutoff frequency to pass through.
Band Stop
Does the opposite of Band Pass filters, blocks all frequencies within a specified range.
High Pass
Only allows the frequencies higher than the cutoff frequency.
High Shelf Pass
Filters frequencies above a selected frequency.
Low Pass
Permits all frequencies lower than the cutoff frequency through.
Low Shelf Pass
A type of filter in which all frequencies below a selected frequency are affected.
Noise Reduction
Reduces unwanted noises within a sound, such as a background hisses, hums or interference, cannot however be used to separate or remove vocals or voices.
Notch
Often referred to as a "band reject filter", attenuates frequencies closest to the center frequency of a filter setting, used to minimize hum or acoustic feedback.
Pop/Plick
Eliminates abrupt changes in a sound, often used in restoration.
Silence Reduction
Deletes silence from a selected part of an audio file
Smoother
Reduces hiss and crackle, often used when restoring old recordings or LPs.
FFT
Applies Fast Fourier Transform (FFT) filter to a selected part of an audio file, smoothes amplitude transitions at various frequencies, points above zero amplify and filter, points below zero attenuate and filter.
Display Features
Waveform
A graphical representation of an audio file that is a mathematical representation of a wave, obtained by plotting a characteristic of the wave against time.
Spectral
Visual display of a frequency graph, the horizontal axis is frequency in Hertz (Hz) and the vertical axis is magnitude in decibels (dB).
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