PRESONUS AudioBox Stereo Quick Start Manual page 194

6.7.3 Audio File Tempo Information
For automatic timestretching to work as described, Studio One needs to know the original
tempo of an audio file. The software can then calculate how to stretch the file to fit the Song
tempo. Many audio loops have this information encoded.
Files without tempo information will not be timestretched, even if the Track's tempo mode is
set to Timestretch.
Studio One offers two ways to define or change the original tempo information of an audio file.
If the original tempo for an Audio Event is unknown, the Arrow tool Timestretch function can
be used to manually fit the Audio Event to a specific length of time (bars and beats, etc). To do
this, set the Tempo mode of the track to "Timestretch." Float the mouse cursor to the edge of
the target Audio Event and hold [Ctrl]+[Alt]/ [Command]+[Option] on the keyboard. The
Define Tempo tool will appear, allowing you to click on the edge of the Event and drag left or
right to stretch it. In this case, the tempo for the original clip will be set based on the musical
length to which the Event is stretched, and all Events in the Song that use this original clip will
be updated.
If the original tempo for an Audio Event is known but is not encoded in the original file that
the Event references, you can easily set the file tempo for the Event in the Inspector. Click in
the File Tempo box, type in a new value and press [Enter] on the keyboard to enter a new file
tempo. If the corresponding Audio Track's Tempo mode is set to Timestretch, entering a new
value in File Tempo will stretch all Events in the Song that use this original clip, based on the
entered tempo value.
6.7.4 Tap Tempo
You can use the Tap Tempo function to set the current Song tempo to the tempo that you
hear in your Audio Events. To do this, repeatedly click on the word "Tempo" in the Transport,
clicking once on every beat you hear. Studio One will determine the Audio Event tempo based
on the timing of your clicks and will set the tempo for the Song accordingly. Be sure that the
Tempo mode for the Audio Track is set to Don't Follow; otherwise, the Events will be stretched
or moved while you are using the Tap Tempo function, making it impossible to find a
consistent tempo.
6.7.5 Timestretching Material Modes
Studio One features several optimized timestretching modes that may yield better results with
certain types of audio material. To access these modes, open the Inspector by pressing [F4] on
the keyboard and click in the Material display. Click on any mode to select it for the currently
selected Track. The modes are:
Drums. Use this optimized mode on any percussion track to achieve the best results
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when stretching percussive audio.
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