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Isolating stereo tracks

 
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normloomer



Joined: 11 Nov 2006
Posts: 17

PostPosted: Thu Jun 19, 2008 10:25 pm    Post subject: Isolating stereo tracks Reply with quote

Here's the situation:

I am processing a concert recording in which the amateur violin
soloist is having serious intonation problems. I know how to fix
that, except that there is piano accompaniment, and fixing the violin
pitch would put the piano out of pitch. (I suspect that would sound
weird.)

However, the violin and piano are recorded on separate stereo tracks,
the piano on the left and the violin on the right. But the tracks are
not isolated, so there is bleeding of each instrument onto the other
track.

My question: Can I somehow isolate the two tracks, removing the
violin residue from the left track and the piano residue from the
right? If I could do that, then I could fix the violinist's
intonation problems without changing the pitch of the piano.

I'm strictly a neophyte and know that what I'm asking may be far-
fetched, but if anyone knows the answer, you folks do.

-Norm Loomer
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Fri Jun 20, 2008 12:38 am    Post subject: Isolating stereo tracks Reply with quote

What I would try is
1) find a section with only piano.
2) invert the piano track
3) fade it from 0 to 1 in intensity
4) add the inverted, faded track and see where the difference cancels
best, figure out what the fade ratio is, invert the entire piano track
and attenuate appropriately and add. See if that does it.

If this works, try the same thing with the violin.

Because of different distances between the piano and the two mikes,
there may well be enough phase shift so it won't work. I suppose you
could try inserting a little silence into the piano track before
subtracting to see if you can compensate that out. I have never tried
any of this, so I don't know if it would work.

If the bleedthrough is small enough, you might try a gate so that only
sound above a particular level gets through.

Good luck.



Norm Loomer wrote:
Quote:
Here's the situation:

I am processing a concert recording in which the amateur violin
soloist is having serious intonation problems. I know how to fix that,
except that there is piano accompaniment, and fixing the violin pitch
would put the piano out of pitch. (I suspect that would sound weird.)

However, the violin and piano are recorded on separate stereo tracks,
the piano on the left and the violin on the right. But the tracks are
not isolated, so there is bleeding of each instrument onto the other
track.

My question: Can I somehow isolate the two tracks, removing the violin
residue from the left track and the piano residue from the right? If I
could do that, then I could fix the violinist's intonation problems
without changing the pitch of the piano.

I'm strictly a neophyte and know that what I'm asking may be
far-fetched, but if anyone knows the answer, you folks do.

-Norm Loomer
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sathyan



Joined: 15 Feb 2009
Posts: 1

PostPosted: Sun Feb 15, 2009 2:41 pm    Post subject: re:Isolating stereo tracks Reply with quote

anyways though i dont have any knowledge about your doubts still i wish you a good time with your concert.
-----
sathyan




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