6.0

NOTE AND AUTOMATION EDITING
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About tempo changes and tempo automation of audio tracks
The built-in Stretch function in the Audio Track devices allows you to change the tempo of the song without affecting
the pitch of the recordings on the audio tracks. This is great if you want to adjust the tempo after you have recorded
your audio tracks. In Reason, the Stretch is enabled by default for all audio clips.
! The Stretch function also affects the sonic result when transposing audio clips using the Transpose function
(see “Transposing Audio Clips”).
There are three selectable Stretch algorithms which are suitable for playing back different types of audio material:
• The “Allround” Stretch type is suited for most types of polyphonic audio material.
• The “Melody” Stretch type is best suited for sources sounding one note at a time e.g. solo instruments.
• The “Vocal” Stretch type is best suited for stretched and/or transposed vocal material.
In the “Vocal” Stretch type the formants of the original vocal are preserved, which prevents the vocal from sound-
ing artificial when transposed and/or stretched.
D Select stretch type from the Stretch Type selector on the Audio Track device in the Rack.
Selecting Stretch Type on the Audio Track device in the Rack
Stretch preview vs. high quality stretch
Stretch and transposition of audio are always made in two parallel steps: a real-time “preview” so that you can in-
stantly hear the result of your tempo changes or transpositions, and a high quality stretch “in the background” to fur-
ther improve the sonic results. As soon as high quality stretch is in progress, the “Calc” indicator on the Transport
Panel shows a progress bar:
The CALC progress bar appears when Reason performs high quality stretching of audio
Since the high quality stretch is performed in the background, you can still continue to work with your song without
any interruption. When the high quality stretch is finished, the “Calc” indicator goes out and the high quality audio au-
tomatically replaces the “preview” audio.
About disabling Stretch for audio clips
In some situations, you might want to exclude audio clips from tempo automation. For example, if you have recorded
dialogue or sound effects that shouldn't adapt to tempo changes. In such situations, you can select the audio clip(s)
you want to exclude from the tempo changes and select “Disable Stretch” from the Edit menu or clip context menu.
! Note that disabling stretch does not affect the Transpose function for audio clips!