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Re: L&R Stereo to MS?

Subject: Re: L&R Stereo to MS?
From: "David Steinwedel" DSteinwedel
Date: Mon Jul 2, 2007 7:05 pm ((PDT))
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--- John Lundsten <>
wrote:

> 
> From: Kevin Colver
> To: 
> Sent: Tuesday, July 03, 2007 12:05 AM
> Subject: Re: [Nature Recordists] Re: L&R Stereo to
> MS?
> 
> 
> I think the following might work in converting MS to
> L&R and back in
> ProTools. If anyone wants to check this they can let
> me know if I am
> doing it right.
> 
> CONVERTING A MS STEREO FILE TO L AND R (L IS MID, R
> IS SIDE)
> 
> 1. Import the stereo file into the ProTools session.
> 2. Highlight the stereo track name
> 3. Split the stereo track into mono, also keep the
> stereo track so
> now you have a stereo track and 2 mono tracks. This
> function is in
> the Track submenu.
> 4. Pan both the L and R of the stereo track
> completely to the L
> JL>>Err, this will give L only (it's a balence
> control)
> 5. Invert the R mono track
> 6. Pan both mono tracks completely to the L
> 7. Bounce the whole thing to disk, it should result
> in a stereo L&R
> track
> 
> Kevin
> No, that's not going to work.
> 
> Converting MS to LR, or L&R to MS is the same, bar
> some gain differences or 
> in PT some overload issues. Just look at the level
> meters & use your ears.
> But
> Basically you need to produce a sum of the 2 tracks
> And a subtraction [same as adding, bar one signal
> needs to be polarity 
> inverted] or difference between the 2 tracks.
> 
> It is really useful to be able to (using MS to LR as
> an example) to control 
> the amount of "S" & Inverse "S"sent to the mix buss
> of your choice.
> I suggest the following in PT:---
> 
> Create 2 mono tracks in PT.
> Pull each half of the stereo track into each new
> mono track, say -- M to 
> Tr1, S to Tr2)
> For "M" (Track 1) pan to C (centre)
> For "S" (Track 2)  pan L, plus send via an Aux
> (unity gain, no FX or Eq) to 
> a new subtrack
> For Aux Return (at unity gain) pan to R & invert
> 
> Now if you vary  track 2 {including Eq & FX} the S
> gets into the Left side 
> buss & via the Aux+Aux return exactly the same
> signal in all respects except 
> polarity gets sent to the Right side.
> To Recap
> Track 1 is the main overall level control (on its
> own this is a complete 
> mono mix)
> Track 2 is the width
> 
> Note for maximum mono compatibility it is important
> that the MS de-code has 
> the same, like exactly the same, amount of S &
> inverse S. to check this is 
> true :-
> pull down Track 1(M)
> Listen to S & inv S in mono, IE add/sum  them. When
> they are EXACTLY the 
> same level you will hear NOTHING, total
> cancellation!
> 
> hope this helps
> JL
> 
> 
> 
> 
> 
> 



       
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