Stereo Enhancer Audio Filter

This filter is used to make an interesting stereo sound from a mono source - more interesting than duplicating the channel, which is the default when not using the filter. Duplicating a mono channel to stereo still sounds mono.

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What are the use cases when the user should pick the source as Middle and Side?

This is based on the FFmpeg haas filter.

The equations for middle and side are:

  • middle = L + R
  • side = L - R

Middle could be useful if you have a source that already has some stereo effects but you want the apply this filter instead. It can also be a convenient way to apply the filter if you do not know if your mono sound is on the left or the right channel.

Side could be useful if you have a split track where left = vocal and instrumental and right = vocal only. I do not know how common this would be.