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Import the stereo file into the ProTools session.

Subject: Import the stereo file into the ProTools session.
now you have a stereo track and 2 mono tracks. This function is in
the Track submenu.
Message: 4. 
Subject: 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)
Message: 5. 
Subject: Invert the R mono track
Message: 6. 
Subject: Pan both mono tracks completely to the L
Message: 7. 
Subject: 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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