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In the new Blender update of 4.0, they changed the workflow of the speed control of audio in the video editor. There used to be a "Speed Factor" value, on audio strips. You could add keyframes to that value and easily edit the speed of the audio.

In Blender 4.0, there is now a "Show Retiming Keys" option to change the speed of audio. You can select the audio strip, and press I, and choose, add Retiming key. You can then drag around the retiming keys, to change the speed of the audio.

However, when i add keyframes, it changes the audio to a consistent speed between the keyframes. I want to be able to gradually change the speed, so there is a smooth transition between the audio speeding up and slowing down. And I want it to also match the speed of the video, if I slow down or speed up a video.

How is this done with the new audio speed controls in Blender?

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Sync Audio-Video Retiming
Select video and audio strip and create a MetaStrip (Ctrl+G)

Smooth Transition Retiming
Check Blender Manual > Retiming > Smooth Transition ... simply select a retiming key between two segments and search for Add Speed Transition.

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... at left -bottom corner change value to something.

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  • $\begingroup$ Thank you for your time and help. Sorry for the late reply. I tried that, but for me, it didn't make the speed change smoothly, it was still at a consistent speed. Also for some reason, its making the audio glitch out and sound really weird and distorted, and have lots of artifacts. Then Blender always crashes and closes after a short time, every time I try to edit the keyframes. It seems to me like there are still a lot of bugs, since this is a newer feature of Blender. Hoping it will be fixed in a later version. $\endgroup$ Mar 2 at 2:57

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