I have a sound ( this one: https://mega.co.nz/#!mQdxWCia!1p48A58YukgvXe-vhE6opelAR-Qhe6tFhwAy7QuKgsQ and i want to extend it during 1.262 minutes and make it going fatser and faster during 1.262 minutes. I can’t see how to do this and it’s why i’m asking for it.
First you need to select a part that will loop seamlessly. http://manual.audacityteam.org/o/man/audacity_selection.html
Try selecting from 1.167 seconds to 2.745 seconds.
Check that it will loop without glitching by pressing Shift+Space. If necessary, zoom in (http://manual.audacityteam.org/o/man/zooming.html) and adjust the selection as necessary.
Once you have a selection that will loop seamlessly, use the “Repeat” effect. http://manual.audacityteam.org/o/man/repeat.html
Repeat it often enough that you have more than the total length that you need - as it speeds up it will become shorter.
Use the Sliding Time Scale / Pitch Shift effect on the entire track to gradually speed up the track. http://manual.audacityteam.org/o/man/sliding_time_scale_pitch_shift.html
Thank you so much you really helped me !
Ps: Sorry for if my english is bad, i’m french