Before / After Audio Player

Hi all,

I am looking to create an audio player that utilizes a switch to toggle back and forth between two different audio files that are contained in the same audio player.

For example, you see an audio player with a play button. You click Play and the audio begins to play. Next to the player is a switch or button or knob. When you click this switch or knob, it turns to a different position. We’ll say the positions are left position and right position. When it’s in left position, you are hearing one mp3 (before version). When it is in the right position, you are hearing the other mp3 (after version). The before and after concept is to showcase work done to a clients audio file.

Any ideas on how this can be achieved?

Thanks