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I would like to take an arbitrary audio file (such as an mp3) and edit it so that the sound "moves" from one speaker to the other every fixed number of seconds.

balance knob

I would like to simulate someone turning the above knob all the way to the left and then all the way to the right (and back again) every, say 3 seconds.

How could I do this, what tools should I use, or where should I look to learn how to do this?


I am using Linux, Ubuntu 12.04 64-bit specifically.

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The answer "Audacity" should be OS agnostic enough and is open source (both, the program and the answer). I could imagine you won't find an actual balance slider but would have to manipulate the level of the two channels in a way to achieve your desired effect.

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