LENCO LS-50 Mode D'emploi page 19

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 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 softer
while keeping the volume of the 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 a 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, -3 dB. 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.
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