Whenever I try to slow down and speed up an audio clip with sliding stretch, it’s almost never perfect. For instance, slowing down a 26.207 second clip by -25% will make it 34.991 seconds. That’s not -25%. I have found some values that pair when slowing down and speeding up.
-20% + 25% = 0%
-50% + 100% = 0% (expected)
-80% + 400% = 0%
What that means is by slowing down a clip by -20% and then speeding it back up by 25%, it will remain the same speed. The relation is not linear like it should be.
Audacity’s speed change arithmetic is correct.
20% off a given speed gives you 80% of the original. If you increase that new speed (80%) by 25%, you should get back to the original. (80×1.25=100)
If you take 80% off a speed, you get a fifth ( (20%) of the original speed. If you increase that 20% speed by 400%, you multiply it by 5 (i.e., back to the original).
Now that you put it like that, it makes more sense. I’ll use that method when reversing it. Thanks!
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