In theory 32 bit floating point audio is the way forward. But how will it change the way you record and mix in Pro Tools? What are the practical benefits and disadvantages? Mike Watkinson explains.

8 In the Pro Tools MP3 Export Option dialog, choose Manual Activation, then click Next. 9 When prompted, type in the Pro Tools MP3 Export Option authorization code. 10 Click Next and follow the on-screen instruc-tions to complete the authorization process. Authorizing the MP3 Export Option with an iLok (Pro Tools 7.3 or Higher Only). Shortly, it is the process of changing format, bit depth and sampling rate in order to match the session’s parameters. For example, if you are working on a 24 bit, 44.1 kHz session and you want to import a 16 bit, 44.1 kHz WAV, that file will need to go through the conversion in order to get a bunch of zeros and ones stuck onto it and magically turn into 24 bit audio. MP3 Option for Pro Tools LE 6.4. The update for MP3 Option owners is installed during Pro Tools installation, either from the Pro Tools LE 6.4 Web Installer or the Pro Tools 6.4 CD: Double-click on the 'Install Pro Tools LE' application. Put a check mark in the box next to 'Update MP3 Codec' on Windows, or 'MP3 Codec 1.3 Update' on Mac.

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New in Pro Tools 10 is the ability to create 32 floating point audio files when recording, in addition to the 16 and 24 bit options that we are accustomed to. Great! But what does this actually mean and what are the implications for your system?

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The Theory

32 bit floating point audio files have a theoretical dynamic range of up to around 1680 dB. Compare that with the 144 dB available from 24 bit recordings and you will realise that it's quite an improvement! In terms of resolution that's a lot more than the human brain could ever decipher. Add to that the fact that there is no audio interface currently available that has Analog-to-Digital and Digital-to-Analog converters that are anything but either 16 or 24 bit and you may begin to wonder - what's the point?


The Advantages

So having your 24 bit recordings in 32 bit floating point format will not change the quality of the initial recordings themselves, but creating audio files in this format before they are processed by plug-ins will help you avoid the following:

  • Clipping during AudioSuite rendering
  • Unnecessary noise introduced by AudioSuite dithering
  • Rounding errors during signal processing
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These issues then are mostly caused by the fact that with either 16 or 24 bit audio the data requires conversion at the point of processing.


The Disadvantages

So, it is a '˜good thing' from a quality point of view to have your audio in the 32 bit floating point format from the start, but is there a downside? 32 bit files are 50% bigger than their 24 bit counterparts, and 100% bigger than the 16 bit equivalent. For example, 60 seconds of 44.1 kHz mono 16 bit audio will take up roughly 5 MB of hard drive space and require a data throughput of 83 kB/s. These figures will double at 32 bit. Still not huge numbers by today's standards maybe, but 10 minutes of a 64 (mono) track session recorded at 32 bit and 192 kHz will take up roughly 28 GB and require data throughput of 48 MB/s just to play back.

Relative data sizes for different bit depth files.


Using 32 Bit Floating Point

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You can set up a new session that creates 32 bit files in the Quick Start dialog or the New Tracks dialog (see images).

Quick Start dialog.


New Session dialog.


In addition, one of Pro Tools 10's new features is the ability to support multiple file formats in the same session (those who have been using Pro Tools since day one please pick yourselves up off the floor!) It is therefore possible to '˜Add' (as opposed to '˜Convert') existing 32 bit files to a session which has been set to record in another file format, and you can also change the recording file format on the fly in the Session Setup dialog (Setup > Session).

Bit depth can be changed mid-Session!


Added to this, the ability to Bounce and Export audio at 32 bit means that, in a more complex workflow, it will be possible to move 32 bit files from one session to another without compromising quality.

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Bounce in 32 bit.


Export in 32 bit from the Clips List.

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Want to learn more about the new features in Pro Tools 10? You've come to the right place as macProVideo.com is an Avid Learning Partner Online!

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Check out all the tutorial-videos for Pro Tools 10 here.


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Pro Tools‎ > ‎

Time Stretching in Pro Tools

Any audio track can be time stretched ('elastic audio'-ed) in Pro Tools - here's how to do it
1) On the audio track you want to stretch, click on the ELASTIC AUDIO icon (it looks like this)




3) The 4 main options (Polyphonic, etc) choose the algorithm PT will use to mess with your audio; they are farily self-explanatory.
4) Choose one of the modes - in this case, I'll choose Rhythmic - as you can see, the track changes a bit:

5) To start stretching and compressing the audio using the algorithm you previously selected, click on the VIEW button and choose WARP

6) Now instead of seeing just the waveform, you'll also see the time stretching stuff:

7) Move your cursor to the bottom of the waveform, and click on one of the vertical lines; you'll see it become darker, and you'll also see a little arrow show up:

8) Now this WARP MARKER is moveable! Click and drag on it to change where that sound will happen! Click on other lines to activate the warp markers - try moving them around!

9) The waveform that you see will always reflect what you will actually hear! By default PT will guess where the TRANSIENTS in the original audio are - if you want to TELL PT where they are, click on the VIEW button and instead of choosing WARP, choose ANALYSIS

10) Now if you double-click in the lower half of the region, you can create warp markers that can be moved in WARP view

After you've done your editing/warping/etc, once you go back to WAVEFORM view, it will appear just like any other audio in your PT session!
Happy warping!















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