[audacity4blind] Re: need your advise on mixing two tracks
- From: David Bailes <david_bailes@xxxxxxxxxxx>
- To: audacity4blind@xxxxxxxxxxxxx
- Date: Wed, 9 Mar 2011 15:22:47 +0000 (GMT)
Hi Joseph,
1. Open the music file (ctrl+o). The project will then contain a single track.
2. Import the speech file - open the file menu, open the import sub menu and
choose audio (ctrl+shift+I). The project will then contain two tracks, with the
speech track below the music track.
3. To move the speech track so that is starts at one minute into the project,
move the cursor to one minute (see below for details), and then open the tracks
menu, open the align sub menu, and choose align with cursor.
With regard to moving the cursor to a specific time, one way to do this is to
use the the selection
start control which is in the selection bar. Assuming that the initial focus is
in the track
table, then an outline of what to do is as follows (see the selection bar an
moving the cursor section of the jaws guide for more details):
1. press ctrl+f6 to move to the selection bar.
2. tab to the pair of radio buttons, and make sure that the length option is
set.
3. tab to the selection start control, and set as desired.
4. to move back to the track table, press ctrl+f6 twice.
Another way of moving the cursor to a specific time would be to use the
shift+period keystroke to move the cursor - you can set the time moved in the
playback page of the preferences dialog where there's a long seek edit box
which
you could set to 60 (seconds). So having set that value, just press home to
move
to time zero, and then shift+period to move to 60 seconds. See the moving the
cursor section of the jaws guide for more details.
With regards to fading, probably the easiest way to start with is to have a
play
with the auto duck effect, which is on the effects menu. This can
automatically
reduce the volume in one or more tracks when the volume in a control track is
above a certain threshold. There is a fade in and fade out for the volume
reduction.
The requirements of the Auto Duck effect are that:
1. The tracks whose volume is going to be reduced are selected, and a
time-range is selected to include all the audio you want to be modified.
2. The control track is the next track after the above tracks, and it isn't
selected.
So if you've got one music track and one narration track in the project:
1. Make sure that the music track is the first track. You can move tracks up
and down the table using the tracks context menu (application key).
2. Arrange for the music track to be selected and the narration track
unselected.
3. Select a time range to include all the audio in the selected track: press j,
and then shift + k.
4. Open the Auto Duck effect from the effects menu, and press Enter to press
the
default OK button.
In fact the Auto Duck dialog contains a number of controls for setting
various
parameters which you may want to adjust. All the time parameters are specified
in seconds, and the volumes in db.
1. The first control is a panel which graphically illustrates the parameters,
and you can just ignore this.
2. The duck amount is the reduction in volume.
3. The maximum pause is the maximum time that the volume in the control track
can be below the specified threshold before the volume in the selected tracks
is faded up again.
4. The time over which the volume in the selected tracks is faded down to the
reduced volume is made up of two parts: the time before and the time after the
time when the volume in the control track exceeds a threshold. These are known
as the outer and inner fade down lengths.
5. Similarly, there are outer and inner fade up lengths.
6. The threshold is the volume in the control track which if exceeded causes
the
volume in the selected tracks to be reduced.
Note that whatever value of maximum pause is set, it is always at least the sum
of the outer fade down and fade up lengths.
Note also that Undo (ctrl+z), and redo (ctrl+y) are very useful when playing
around with effects.
David.
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