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254 AUDIO EDITOR
Changing pitch
An audio file's pitch defines how high or low it sounds. A high pitch may be very
shrill, like a whistle, while a low pitch may be very deep, like a fog horn. To adjust
an audio file's pitch, click Effect: Pitch. This opens the Pitch dialog box where
you can raise or lower the pitch by dragging on the Pitch slider. Moving to the left
lowers the pitch, while moving to the right makes it higher.
Quantizing a waveform
When you record audio data, you need to indicate the sample size, or the number
of bits used to store the resulting file. This can be either 8-bit or 16-bit. The more
bits the better the quality of the recording, but the greater the size of the audio
file. If you need to reduce file size, but still want to maintain a good level of
quality, you can quantize the file by clicking Effect: Quantize. This command
opens a dialog box which allows you to specify the number of bits allocated to the
file, 1-7 for 8-bit files and 1-15 for 16-bit files. Often, a small reduction in the
number of bits is all you need to bring the file size down while at the same time
maintaining audible quality. (If you reduce the number of bits too much, you will
'clip' the sound, thereby producing noticeable distortion.)
Waveform before changing audio level
Waveform after changing audio level by 200%
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