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acapella?

nic ullman
is there anyway to remove the music from the track and leave the vocals to make it acapella? please reply


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Re: acapella?

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    | From nic ullman
    | Sun, 28 Jan 2007 20:56:32 +0000 (GMT)
    | Subject: [Audacity-help] acapella?
    | is there anyway to remove the music from the track and leave the
    | vocals to make it acapella?

There isn't any way to do this with any guarantee that you'll cleanly
isolate the vocals from the rest of the track, unless you actually have
access to the original vocal track that went into the final mix.

It may be possible to subdue the background music or bring the
vocals forward if one or both is concentrated in particular
frequencies. An example where the instrumental could be pushed
into the background would be where the vocal is a high female voice
and the instrumental a bass instrument. Selecting the track and
clicking Effect > FFT filter or Effect > Equaliser would allow you
to reduce the bass frequencies and/or increase the high
frequencies.

If you have a stereo track then according to how it's panned
you could (bear in mind both these scenarios are not very likely):  

1 ) If the backing is mixed hard into one channel and the vocals hard
into the other channel, split the stereo track in Audacity by clicking on
the track dropdown menu (by the mute/solo buttons) > Split stereo track
and delete the backing track by clicking [X] on the track panel.  

2) If the backing is panned in the centre of a stereo track the so-called
"vocal removal" technique might *sometimes* work. This technique
is called thus because vocals are not infrequently panned in the centre
of pop music tracks and this technique acts to remove what is panned
centre (i.e. common to both tracks), leaving behind what is different.
If you wanted to try this technique in Audacity, you split the stereo track
into its two channels as above, make both mono, invert one of them,
and play back the result - see here for full instructions
http://audacity.sourceforge.net/help/faq?s=editing&i=remove-vocals

If this works for you on any track and you want to save the resultant
track with "backing removed": select both tracks by shift-clicking in
their track panels or selecting one and dragging the selection across
the other, and click Project > Quick Mix.  Note if you still want to
retain the original tracks that included the backing, select them
before doing Quick Mix and click Edit > Duplicate.  

As vocals are more typically panned centre than not, a tool to
isolate what is common to both tracks is more likely to help
you than trying to remove what is common, which is all Audacity
can do. Algorithms for isolating what is common to tracks are still
very much in development but if you wanted to try them, there are
two VST plugins for Windows we know of which you could run in
Audacity. These may be able to isolate the vocals as long as they are
centre-panned.

This one is free (knOckOut)
http://www.freewebs.com/st3pan0va/

and this one is commercial (VoiceTrap)
http://www.cloneensemble.com/vt_main.htm

If you wanted to try either KnOckOut or VoiceTrap in Audacity you have
to copy the unzipped .dll file from each plugin's zip file, along with
the unzipped Audacity vst-bridge.dll from this download
http://audacityteam.org/vst/vst-bridge-1.0-win.zip

into Audacity's Plug-Ins folder. This is normally at

C:\Program_Files\Audacity\Plug-Ins

On restarting Audacity the new plugins will appear in the Effect Menu
underneath the divider.

Note that all VST plugins in Audacity only have a generic tabular
interface due to licensing restrictions imposed on us by Steinberg.  

Should vst-bridge.dll not work, try the previous VST Enabler for
Windows:
http://audacityteam.org/vst/VST-Enabler-0.1.3.zip

and just place the unzipped VST-Enabler.dll in Audacity's Plug-Ins folder along
with the plugin's own .dll and close and restart Audacity.
 

Gale Andrews




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