Adobe AUDITION 3 User Manual page 104

Enter percentages for Left Mix and Right Mix:
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• When you convert a waveform from mono to stereo, the Left Mix and Right Mix options let you specify the relative
amplitude with which the original mono signal is placed into each side of the new stereo signal. For example, you
can place the mono source on the left channel only, the right channel only, or any balance point in between.
• When you convert from stereo to mono, the Left Mix and Right Mix options let you control the amount of signal
from the respective channel that will be mixed into the final mono waveform. The most common mixing method
is to use 50% of both channels.
Click OK.
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To remove all or most of the lead vocals from many stereo music recordings, you can convert a stereo waveform to
mono with a Left Mix of 100% and a Right Mix of –100%. Most vocal tracks are positioned in the middle of the stereo
field in-phase, so converting the signal so that it's out of phase often greatly reduces or eliminates the vocal track's level.
Create a stereo waveform from two mono waveforms
1 Copy the mono waveform you want to place in the left channel.
Create a new file, and choose Edit > Mix Paste.
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3 Select Overlap, and deselect Lock L/R. Set the left volume to 100%, set the right volume to 0%, and click OK.
Copy the mono waveform you want to place in the right channel.
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Switch back to the new file you just created, and choose Edit > Mix Paste.
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6 This time, set the left volume to 0% and the right volume to 100%. Click OK.
Change the bit depth of a file
The bit depth of a file determines the dynamic range of the audio. For example, 8-bit resolution provides 256 possible
unique volumes, while 16-bit resolution provides 65,536 possible unique volumes. Adobe Audition supports up to
32-bit resolution. You can raise the bit depth of a file to gain a greater dynamic range, or you can lower the bit depth
to reduce the file size.
Work at the 32-bit level when processing audio, even if you plan to downsample to 16- or 8-bit for output. You'll
achieve better results than at the 16- or 8-bit level. The only time you may want to work at the 16- or 8-bit level is
when processing a very large file on a slow computer.
1 Choose Edit > Convert Sample Type.
Select a bit depth from the Resolution list, or enter a custom bit depth in the text box.
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3 When you select a lower bit depth, Adobe Audition provides dithering options to help reduce noise and distortion.
Set the following options as desired, and click OK:
Although dithering introduces a small amount of white noise, the result is far preferable to the increased distortion
that you would otherwise hear at low signal levels. Dithering also lets you hear sounds that would otherwise be
masked by the noise and distortion limits of 8-bit audio.
Enables or disables dithering. If dithering is disabled, Adobe Audition truncates the audio,
Enable Dithering
meaning that unused bits are simply chopped off and discarded. The result gives a crackly effect that fades in and out
on very quiet audio passages.
Sets the bit amount of dithering to be applied. In general, values of 0.2 to 0.7 give the best results
Dither Depth (Bits)
without adding too much noise. Note, however, that as this value is lowered, other unwanted harmonic distortion
noise appears. (Lower values are usually OKay if you also apply Noise Shaping.)
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