18
Silence
- inserts silence
Tone...
- you can create a Sine
wave, Square wave, or Sawtooth
wave.
White Noise
- inserts random audio
samples, which sounds like pure
static.
Any items which appear after these
three built-ins are VST, Ladspa, or
Nyquist plug-ins. It is possible for a
poorly written plug-in to crash
Audacity, so always save your work
before using a plug-in. Note that
any effect that doesn't take any
audio as input will automatically be
placed in the Generate menu.
Effect Menu
The items in this menu only work
when you have audio selected.
Audacity does not have any real-
time effects; you must select the
audio, apply the effect, and then
listen to the results.
Most effects have a Preview button.
Clicking on this button plays up to
three seconds of audio, allowing
you to hear what it will sound like
after the effect is applied. This is
useful for fine-tuning the effect
parameters.
Repeat Last Effect
- selecting this
command is a shortcut to applying
the most recent effect with the
same settings. This is a convenient
way to quickly apply the same effect
to many different parts of a file.
Amplify
- changes the volume of
the selected audio. If you click the
"Allow clipping" checkbox, it will let
you amplify so much that the audio
ends up beyond the range of the
waveform, and is clipped (distorted).
The default value when you open
the effect is to amplifiy so that the
loudest part of the selection is as
loud as possible without distortion.
Bass Boost
- enhances the bass
frequencies in the audio.
Change Pitch
- changes the
pitch/frequency of the selected
audio without changing the tempo.
When you open the dialog, the
starting frequency is set to
Audacity's best guess as to the
frequency of the selection. This
works well for recordings of singing
or musical instruments without
background noise. You can specify
the pitch change in one of four
different ways: musical note,
semitones, frequency, or percent
change.
Change Speed
- changes the
speed of the audio by resampling.
Making the speed higher will also
increase the pitch, and vice versa.
This will change the length of the
selection.
Change Tempo
- changes the
tempo (speed) of the audio without
