When you change the tempo of a project that contains audio, Cakewalk allows you to automatically stretch or shrink audio clips to follow the changed tempo. Otherwise, the MIDI tracks will speed up or slow down while the audio tracks will play at the same speed.When you change the tempo of your project, audio clips that have stretching enabled change tempo along with the project, while those that do not have stretching enabled do not. Audio clips that do not have stretching enabled change in size when moved to a part of your project that has a different tempo.
An audio clip’s Time Base property determines what happens to the clip’s start time when you change the project tempo. You specify the time base in the Clip Properties Inspector’s Properties section (see Properties Inspector - Clip Properties and Properties section). The two Time Base options are as follows:
Musical (M:B:T). If the clip is set to the Musical time base, the clip’s M:B:T position stays constant, and its Absolute (SMPTE) position shifts.
Absolute (SMPTE). If the clip is set to the Absolute (SMPTE) time base, its Absolute position stays constant, and its M:B:T position shifts.
If you record without a metronome or import an audio recording, the audio will most likely not align perfectly to the project’s tempo (measure and beat grid). You can set the initial project tempo to match the recording as closely as possible, but the tempo will likely drift over time due to human performance variations and imperfections.
Conform the project tempo to the audio. With this solution you create a tempo map that matches the audio. The metronome click will perfectly follow along with the audio. Use this solution if you want to retain the recorded human performance variations. For details, see Setting the project tempo from an audio recording.If you want audio clips to follow tempo changes, configure the clips to follow tempo changes before you change the project tempo. An audio clip can use either AudioSnap or Groove Clip stretching to follow tempo changes:
3. Click the Clip Follows Project Tempo button on the AudioSnap palette.The clip(s) displays the Auto Stretch icon , and is synchronized to the project’s tempo map (including future tempo changes). The drop-down list lets you specify at which resolution the clip should follow tempo changes. The options are as follows:
Note: The Clips follow project tempo command only works on clips that are configured to use musical time (the Time Base property is set to Musical in the Clip Properties Inspector).
Figure 143. AudioSnap paletteAlternatively, you can enable Follow Project Tempo in the Clip Properties Inspector:
2. In the Clip Properties Inspector’s AudioSnap section, select Enable, then select Follow Project Tempo.
3. Under Follow Options, specify at which resolution the clip should follow tempo changes:Figure 144. Clip Properties Inspector.
2. In the Clip Properties Inspector’s Groove Clip section, select Stretch to Tempo.The audio clips stretch or shrink to fit the project’s tempo. Cakewalk uses the Beats in Clip and Original Tempo parameters to make the change.Audio clips that do not have Stretch to Tempo enabled change in size when moved to a part of your project that has a different tempo.Figure 145. Clip Properties Inspector.For more information about Groove clips, see Working with Groove Clip audio and To set the tempo of a Groove Clip.
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