9 replies to this topic

[Mojoe]

Did a live recording the other week Had my protools session set to 44.1K, portools was set a the slave. But when the 003 unit played just befor the live recording, ther was alot of people around the two units and the 8mic pre's was set to record at 48K, didn't figer it out till later that the unit was set at 48K, did about 2 and half session befor I figered it out. so how do I convert a session at 44.1 and the recording done at 48K back down to 44.1, try and try but the audio comes out slow?

Please Help

MOJOE

[ehsan]

I wouldn't have a clue to help you, but uberlolz at at portools. ;D

[rhythmboy]

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I wouldn't have a clue to help you, but uberlolz at at portools. ;D

Oh you...

Joe, if my brain is working right I think you should be able to fix it but you need a second device that the 003 can become word clock slave to.

But first, some guerilla tactics...

- put the tracks in ableton, warp them up to correct pitch and speed (~10%) and render out
- find a mate with a PC and copy of Sound Forge or similar. I know this one has a 'resample' function that will change it from 44.1 to 48 or vice versa, and repitch it up or down.

Problem with these is dubious sound quality  :-

Or keeping with Pro Tools and the second machine...

Open your problem session, with the clock source internal (I'm not going to tell you which menu, I'm too tired). You session should be showing 44.1khz in session setup window.

Hook up optical or spdif out from the other unit to the input of your 003.

Set the other unit to 48khz

Now change your session's clock source to 'optical' or 'digital (spdif)' whatever matches the plug you've used.

This should force Tools to lock to the other unit, thus forcing your 44.1 session 'up' to play at 48khz. To a normal session, it would speed up. But yours is already slow, so this should revert it back to normal.

If you get it playing normal, I'd suggest recording the tracks out via analog to another recorder. If you use two pt systems, you can record back into the one you're using as the clock master. So you run digital in to your sesssion, but analog out. The new recording is thus a 'fresh' sampling of analog signal, rather than risking degraded bits by shoving digital up and down too much.

Unless Anders has a simpler solution...  :

[Captain Terrific]

surely protools has dithering...

[rhythmboy]

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surely protools has dithering...

Yes but totally different issue. Dithering is used when reducing bit resolution from (eg) 24 bit to (eg) 16 bit. The issue here is sample rate related. The software's intended sample rate didn't match the hardware's actual sample rate.

Actually Joe, have you tried something as simple as import the audio files into a new session created in 48k? Does it sound normal then? Maybe you just have to finish the project in 48k and worry about CD masters later...

[niktu]

Hey RB & co, if Mojoe has PT8 (do you have PT8?), is it an option to simply set up a 44.1 kHz session and just use the new time warping feature(s) in PT8 to straighten things up? Couldn't he just check the time length of the stems at 48kHz in a 48kHz session, make a note, then create a new 44.1kHz session and use time adjuster (or whatever it's called - haven't done a PT session for a while) to re-set the time length to be the same at the new sampling rate? Or something like that.

[Captain Terrific]

note to self. Dont try help after drinking 2 litres of beam and coke...

[Spectrum]

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note to self. Dont try help after drinking 2 litres of beam and coke...

Life wasn't quite the same after K-Rudd whacked us all with his alcopop tax, eh?! ;D

Good question though, and one that's come up on the DUC a few times over the years. Can't recall what the best practice was.

If the session must be 44.1 k, then I'd be tempted to do the live re-recording analogue-style onto another Pro Tools recording rig, but it makes sense that with all the new pitching tools, once could do it all in the box.

It's just a sample rate / pitch issue (where tempo and pitch are adjusted together, ala the pitch slider on a vinyl turntable), so I don't expect speeding up/down would do anything like as much harm as messing with pitch while forcing a strict tempo would do (master tempo on a CDJ).

[Anders]

The best way must be the simplest right?

1. Create a new session at 48KHz
2. File >Import > Session Data
3. Select the tracks which were recorded at 48KHz
4. Un-check "Apply SRC"
5. Hit OK

Now you can import those tracks back into your original session using the same method. This time check "Apply SRC" and convert from 48KHz back to 44.1KHz.

[Spectrum]

^^^ Ah, and that's why you're getting paid the big bucks!