Pro tools sample rate problem
tomeford
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#1
17th February 2010
Old 17th February 2010
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Pro tools sample rate problem

This week i've been working from a studio with pro tools LE 6.4 in 2 rooms. (Tracking and mixing rooms)

I recorded a session in 24 bit 48k as that is the highest the 001 can do.

The problem is trying to open the session in the mixing room which is the exact same set up, play back has gone all speedy on me.

The session info shows that it is open at 24 bit 48k but it doesn't sound like that is the case.. Both computers are set to internal clock.

Also, I bounced a rough mix from the recording room to take home and listen to, and opening it up in audition it had the same sample rate problem.. Every other time I have recorded in 48k at other studios audition has been able to figure out and play back properly for me but this time I had to adjust the sample rate (not convert) so i could listen back at the correct speed..
I'm pretty lost for solutions and time is not on my side.

Any help would be superb!

Thanks
#2
17th February 2010
Old 17th February 2010
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any other converters involved outside of the 001? if so sounds like that wasn't set to 24/48. I've never used a 001 so I don't know how it works but it sounds like the audio got recorded at 44.1 and it's trying to play back on 48 (which you probably already knew). have you tried going back to the other room and recall your exact set up and seeing if the problem was still there?
tomeford
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17th February 2010
Old 17th February 2010
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Yes that is exactly what it sounds like.
There is no other converting going on.
It works fine in the original tracking room.
I've just tried it at home and it is playing wrong.

Both sessions are set to 48k. to set the sample rate in pro tools 6.4 and 001 you choose what you want when you create the session. It then sets the playback sample rate of the hardware automatically when you open the session.

Looking at home on my pro tools 8 m powered system if I manually set the sample rate to 44.1k and then open the session it automatically changes the sample rate to 48k.

I can't see how you can change it mid session.
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17th February 2010
Old 17th February 2010
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Your problem is that the session recorded at 48k, but the clocking was at 44.1. Probably from an external convertor which was at 44.1.

To fix the issue, create a new session at 44.1, and "import session data" then make sure that src (sample rate conversion) is unchecked. This will import all audio files at 44.1 kHz, when the audio files are thought to be 48khz.
tomeford
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17th February 2010
Old 17th February 2010
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Great! thanks Thumper
Tried that out on home set up and it's playing back correctly.

Will look in to what caused the problem when i go back in tomorrow.
Must be something in the set up I wasn't told about.

Thanks so much!
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