How to use Varispeed in Logic to speed up a track, overdub a part, and then have the new part slow down with the existing track when brought to original tempo
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To use Varispeed in Logic Pro for overdubbing a part at a faster tempo and then having it conform to the original project tempo, follow these steps: 1. Enable Varispeed in the Control Bar: Right-click on an empty area of Logic Pro's Control Bar (the display at the top of your screen). From the context menu, choose "Customize Control Bar and Display," and then check the "Varispeed" option to make it visible. 2. Activate and Set Varispeed: Click the Varispeed button in the Control Bar to turn it on. Next, click on the Varispeed display itself (which might say "Speed Only" or "Speed and Pitch") to open its parameters. Adjust the percentage or the resulting tempo to your desired faster speed. For most overdubbing scenarios where you want to play along in the original key, select "Speed Only" to change the tempo without altering the pitch of existing tracks. 3. Record Your New Part: With Varispeed active and set to your faster tempo, record your new audio part. Play along with the sped-up project. Logic will capture your performance at the actual faster tempo you are hearing. 4. Disable Varispeed: Once you have finished recording, click the Varispeed button in the Control Bar again to turn it off. The newly recorded audio region should automatically adjust its playback speed to match the project's original tempo, effectively "slowing down" to fit the original timeline and pitch.
- 1.Flex Time as an Alternative: While Varispeed is designed for this purpose, some users have reported sync issues with newly recorded audio when Varispeed is disengaged. If you encounter problems, consider enabling Flex Time on all existing audio tracks *before* engaging Varispeed, or change the project tempo directly and then record. Flex Time offers robust audio manipulation and tempo adjustment.
- 2.Varispeed Mode Choice: The "Speed Only" mode changes tempo without altering the pitch of existing audio, which is generally preferred for maintaining the original key during overdubbing. "Speed and Pitch" emulates a tape machine, changing both tempo and pitch. Your choice depends on whether you want the pitch of the existing track to shift while you're recording.
- 3.Project Start Marker: Ensure your project start marker is at its default 1 1 1 1 position. Moving it from this default can sometimes cause sync issues when recording with Varispeed.
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