Discuss the various methods you use in music production, from compressor settings to equipment type.
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By Shostakovich Thu Sep 23, 2010 7:31 am
Not entirely possible.

However, if you have the A Capella, you can line it up with the full track up in a DAW and flip the phase on the A Capella. Should remove most of it but you'll still be left with a little: the difference between the mixes.
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By Shostakovich Thu Sep 23, 2010 11:44 am
Well, like I said, this won't get rid of all of it and you'll have potential phase issues should the A capella be mixed differently. You may also lose anything else panned center.

The premise being that two identical signals played out of phase with each other will cancel out.

Therefore, using the A capella in phase reverse and blending it to the full track will remove, all things being equal, the vocal track in the mix.

In practice, you'll find that it only partially removes the signal.

For any of this to work, you need to accurately line up the audio at sample level.

I just found this great explanation:

http://www.soundonsound.com/sos/sep04/a ... 0904-7.htm
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By dabmeister Thu Sep 23, 2010 1:44 pm
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By Shostakovich Thu Sep 23, 2010 2:47 pm
These are melodyne applications:

*
manual or automatic correction of intonation and timing errors
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refashioning of melodies, harmonies, timing and rhythm
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transposition including adjustment to scale
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modifying various note parameters such as volume, vibrato, formant spectrum
*
pitch shifting and time stretching
*
(re-)quantization
*
MIDI file export

Where exactly does it mention removing vocals?

Seriously, if OP has a DAW, the Karaoke effect is the most effective method - but not 100%. Nothing is.
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By dabmeister Thu Sep 23, 2010 3:38 pm
How did you miss this...

Monophonic and Polyphonic Material:

In the case of monophonic (solo voice, saxophone, bass guitar...) and polyphonic (piano, guitar...) audio material.
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By Shostakovich Thu Sep 23, 2010 6:19 pm
That means nothing other than melodyne can be used to modulate these sound sources.

This, from the FAQ, is more definitive:

Is it possible using Melodyne to extract individual instruments from a mix?

No. Our Direct Note Access technology isolates polyphonic notes by pitch, not by instruments. If two instruments are playing the same note at the same time, you will see one blob only that includes the sound of both instruments.


Thus, if one were to remove that "blob", all other sounds it is masking would also be removed.

This Youtube video goes through the phase cancellation process for anyone still interested:

http://www.youtube.com/watch?v=6F1oJSlObbE
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By dabmeister Thu Sep 23, 2010 9:33 pm
^^^ Melodyne seems to be a hit or miss option. You won't know until it's tried. I agree that phase cancellation is another option too.
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By Ill-Green Sat Sep 25, 2010 5:04 am
It all depends on the signal though, if its mono you won't be able to remove the voice successfully as you would with a stereo signal. I used to have a battery powered voice remover from Radio Shack and that did the trick but you can hear the voice slightly like a ghost moaning, which was cool with me since I'm on the darkside of music. But others will have a problem.

There was a program that removes any instrument and/or voice with the use of PhotoShop. Kind of expensive and time consuming, but whatever sound your ear perceives you can extract it out. I'll hunt for that thread.
By oxide54 Sun Sep 26, 2010 1:32 pm
if your doing the phase inversion thing, ideal source material would be the instrumental and acapella from the CD single.

as soon as you start doing it with random MP3's you d/l'd, you find one is at a different speed to the other. how most likely some kid has recorded it from his turntables and shared the MP3. + going through his mixer / sound card will affect it. + the process of converting to MP3 will affect it as well.

I did have quite good success a few years ago with just the track (no instrumental + no acapella) actually chopping the kicks and snares from earlier in the song when they were open, and mixing them in phase inverted when the beat dropped with the vocals. It took hours even days to line it all up. but the thing with this one the track was from when drum machines started being popular early eighty's. so a lot of the hits were virtually identical. try doing that if they used a live drummer, no chance.

peace