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 re-sampling. 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 changing the pitch. This
will change the length of the selection.
Compressor
– compresses the dynamic
range of the selection so that the loud parts are
soft parts the same. You can optionally
normalize the recording afterwards, resulting in
the entire piece having higher perceived
volume.
Echo
– very simple effect that repeats the
selection with decay, sounding like a series of
echoes. This effect does not change the length
of the selection, so you may want to add silence
to the end of the track before applying it (using
the Generate Menu).
Equalization
–
Boost or reduce arbitrary
frequencies. You can select one of a number of
different curves designed to equalize the sound
of some popular record manufacturers, or draw
your own curve.
Fade In
–
fades the selection in linearly.
Fade Out
– fades the selection out
linearly.
FFT Filter
– similar to Equalization, lets you
enhance or reduce arbitrary frequencies. The
curve here uses a linear scale for frequency.
Invert
– Flips the waveform vertically, the
same as a phase inversion in the analogue
domain.
Noise Removal
– This effect lets you clean
up noise from a recording. First, select a small
piece of audio that is silent except for the noise,
select “Noise Removal”, and click on the “Get
Noise Profile” button. Then select all of the
audio you want filtered select “Noise Removal”
again, and click the “Remove Noise” button.
You can experiment with the slider to try to
remove more or less noise. It is normal for Noise
Removal to result in some distortion. It works
best when the audio signal is much louder than
the noise.
Normalize
– allows you to correct for DC
offset (a vertical displacement of the track)
and/or amplify such that the maximum
amplitude is a fixed amount -3Db. It’s useful to
normalize all of your tracks before mixing. If you
have a lot of tracks, you may then need to use
the track gain sliders to turn some down.
Summary of Contents for USB-TR08
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