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Alécio Costa 30 September 2003

Phase problems after Processing SD2 file with TComp/EXP

Hi!
I was "mastering" a Horn band album a few hours ago and then I faced this problem..
My client, the conductor, felt he conducted with a too low bpm.. yes, after almost 6 months of recording/editing/ production's day 01.

Ok, I could do the TC exp to every single track..OH My God...

Examining the final SD2 44k/24 bit PT 5.1.1 TDM file (Mix system) which sounded ok before TComp/ exp... Phase was fine too.

I processed the file with Digirack's Tcomp/exp audiosuite plugin and then, it started sounding quite funny in Mono.

Phase read-out at PAZ becomes aggressivelly anti-phase.
So.. any ideas besides re-recording everything or TC/exp each individual track?

Would you recommend me any other TC/EXP plug?
I don't think the junior mastering Waves are adding so much phase problems because everything sounded fine before the audiosuite processing.

BTW.. I was increasing speed from (varies from 103 to 109) to +2.5%.
Maybe are the random speed bumps/breaks that "damage " the phase?

Thanks in advance
Nice week
:s:

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Comments

anonymous Tue, 09/30/2003 - 17:45

Hey Alecio.

Yes unfortunately i think you will need to go back and do this speed ramp in the Orig session.
Some suggestions if I may.

Use the serato plug.
Strap any mono tracks and treat them as stereo.
Find someone with Digital performer and try the timecomp/exp function there. VERY good.
Did you try the the process on the Stereo file?
Also ( and this is time consuming) try a prog like SONICWORX.

I will think some more and hopefully someone here will come up with a helpful answer.

Best of luck.

Michael Fossenkemper Thu, 10/02/2003 - 06:00

Strings are the hardest thing to time-compress. They are very complex waveforms with lots of overtones and harmonics. Not to mention that they sustain and any fluctuation is very noticeable. Once I found that dumping the mix to 1/2", vari-speeding it to the tempo I wanted and then pitch-shifting it down sounded the best. Some other times I found that doing it in small steps worked better. It's really a trial an error process with strings.

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