You can do that in Audacity with the “Punch Copy/Paste” plug-ins: Punch Copy/Paste
Other effects that can scramble the sound are, the “Reverso” effect (Reverso) and “Scratch effect” (scratch.ny scratching effect - #2 by steve)
You can do that in Audacity with the “Punch Copy/Paste” plug-ins: Punch Copy/Paste
Other effects that can scramble the sound are, the “Reverso” effect (Reverso) and “Scratch effect” (scratch.ny scratching effect - #2 by steve)