YouTube just suggested this video for me:
https://www.voxengo.com/product/msed/
These details are often hard catch when critical listening songs to get ideas from. One freeware I can recommend is the MSED which splits the mono-stereo, not built for such cause but may help better focusing.
To me, it's also a relatively safer tool to be used for stereo widening instead of "widener" plug-ins when mastering.
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