[audacity4blind] Re: Using auto ducking
- From: David Bailes <david_bailes@xxxxxxxxxxx>
- To: audacity4blind@xxxxxxxxxxxxx
- Date: Wed, 5 Feb 2014 10:59:12 +0000 (GMT)
Hi Johny,
here are some notes on the auto duck effect:
The Auto Duck effect reduces (ducks) the volume in the selected audio during
the periods in which the level of another track, known as the control track,
exceeds a certain threshold. The Auto duck effect uses the last unselected
track which
follows a selected track as the control track.
So, for example, if you've got one music track, and one voice track in the
project, and you want to reduce the volume of the music when there's speech
in the voice track:
1.Make sure that the music track is the first track. If it isn't, you can
move a track up or down the track table by opening its menu, and choosing
Move Track Up or Move Track Down respectively.
2.Make sure that the voice track is not selected.
3.Select all the audio in the music track. To do this, first make sure that
the track is selected. Then select a time range that includes all the audio
in the track: press J to move the cursor to the start of the audio in the
selected track, and then press Shift + J to select from the cursor to the
end of the audio in the selected track.
4.On the Effects menu, open the Auto Duck dialog, and if you've happy with
the default settings, then just press Enter to press the default OK button.
Auto Duck settings:
- Duck amount. This is the amount of volume reduction of the selected audio
during the periods when the level in the control tracks exceeds the
threshold. Its given in decibels, and its default value is -12dB.
- Maximum pause. If the time between two periods when the level in the
control track exceeds the threshold is less than the Maximum pause
parameter, then the selected audio continues to be ducked in this time –
there isn't a fade up and then a fade down. If for example the control track
contains speech, then if there are pauses less than the maximum pause, then
the selected audio continues to be ducked during this period. The default
value of Maximum pause is 1 second. Note that regardless of this setting the
Maximum pause is always at least the sum of the outer fade lengths, which
are described below.
- Fade lengths. The time over which the volume in the selected audio is
faded down to the reduced volume is made up of two parts. The volume of the
selected audio can start to fade down before the level in the control track
starts exceeding the threshold. This time interval is known as the outer
fade down length, because it occurs outside of the time when the threshold
is exceeded, and its default value is 0.5 seconds. In addition, the volume
can finish fading down after the threshold starts to be exceeded. This
interval is known as the inner fade down length, because it occurs inside
the time when the threshold is exceeded, and its default value is 0 seconds.
In an entirely similar manner, the time over which the volume in the
selected audio is faded back up is also made up of two parts: the inner and
the outer fade up lengths, which have default values of 0 and 0.5 seconds
respectively.
- Threshold. The selected audio is ducked during the periods when the level
in the control track exceeds this threshold. It's given in decibels, and its
default value is -16dB.
David.
--------------------------------------------
On Wed, 5/2/14, Johny Cassidy <johny.cassidy1@xxxxxxxxx> wrote:
Subject: [audacity4blind] Using auto ducking
To: "'audacity4blind@xxxxxxxxxxxxx'" <audacity4blind@xxxxxxxxxxxxx>
Date: Wednesday, 5 February, 2014, 10:36
Hi there
Keen to try and use auto ducking now with a music bed.
Any chance anyone can explain how it works? Is it easy
enough to use and pretty straight forward? Thanks
Johny Cassidy
Today programme and BBC Business News
New Broadcasting House
London
TEL: 0203 6142555
Mob: 07900 513293
TWITTER: https://twitter.com/johnycassidy
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