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For image files the comparison pane (right hand side) shows both images and for text files it shows both files (but does not do a highlight of differences yet).
For audio files I'm thinking of displaying the waveform of the left and right channels in the comparison pane. In the middle there will be buttons to play both files simultaneously. i.e. left channel of left file and right channel of right file. Or right channel of left file and left channel of right file, so that the user can hear the difference.