Audacity has a “Change Speed” effect, but it is only accurate to three decimal places. For greater accuracy a short Nyquist script can be used in the Nyquist Prompt effect.
(setq current-duration 599.999)
(setq target-duration 600)
(force-srate (/ (* *sound-srate* target-duration) current-duration) s)
In this example the length of the selected audio was 599.999 seconds and I wanted to stretch it to 600 seconds duration. The durations … Continue reading Changing the speed and length very accurately