6.0

169
Audio processing and functions
Normalize
The Normalize function allows you to specify the desired
maximum level of the audio. It then analyzes the selected
audio and finds the current maximum level. Finally it sub
-
tracts the current maximum level from the specified level
and raises the gain of the audio by the resulting amount (if
the specified maximum level is lower than the current max
-
imum, the gain will be lowered instead). A common use for
Normalizing is to raise the level of audio that was recorded
at too low an input level. The dialog contains the following
settings:
Maximum
The desired maximum level for the audio, between -50 and
0 dB. The setting is also indicated below the Gain display
as a percentage.
Pre-Crossfade and Post-Crossfade
See “Pre/Post-Crossfade” on page 167.
Phase Reverse
Reverses the phase of the selected audio, turning the
waveform “upside down”.
The dialog contains the following settings:
Phase Reverse on
When processing stereo audio, this pop-up menu allows
you to specify which channel(s) are phase-reversed.
Pre-Crossfade and Post-Crossfade
See “Pre/Post-Crossfade” on page 167.
Remove DC Offset
This function will remove any DC offset in the audio selec-
tion. A DC offset is when there is too large a DC (direct
current) component in the signal, sometimes visible as the
signal not being visually centered around the “zero level
axis”. DC offsets do not affect what you actually hear, but
they affect zero crossing detection and certain process
-
ing, and it is recommended that you remove them.
Resample
The Resample function can be used for changing the
length, tempo and pitch of an event.
The original sample rate of the event is listed in the dialog.
Resample the event to a higher or lower sample rate by ei-
ther specifying a sample rate or by specifying the differ-
ence (as a percentage value) between the original sample
rate and the desired new one.
• Resampling to a higher sample rate will make the event
longer and cause the audio to play back at a slower speed
with a lower pitch.
• Resampling to a lower sample rate will make the event
shorter and cause the audio to play back at a faster speed
with a higher pitch.
• You can audition the result of the resampling by enter-
ing the desired value and clicking “Preview”.
The event will then be played back as it will sound after the resampling.
• When you are satisfied with the preview result, click
“Process” to close the dialog and apply the processing.
Reverse
Reverses the audio selection, as when playing a tape
backwards. There are no parameters for this function.
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It is recommended that this function is applied to
complete audio clips, since the DC offset (if any) is
normally present throughout the entire recording.