Many recordings are not perfectly balanced. I cannot find a balance control.
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No, The speakers are set up properly. But not all recordings are balanced properly, hence the need for a balance control you can use along with the volume vcontrol. It should be easy to implement.
Not all music are created with vocals dead center; this is intentional (and not a mistake). I suggest listening to the music like it was mastered
The speaker setup control in Roon is effectively a balance control, but is not (as I understand it) bit perfect. A balance control on a preamp will provide the same function, increasing volume in on one channel while lessening in the other.
None of these actions is a free lunch scenario, but can compensate for room idiosyncrasies, speaker setup, or hearing deficiencies.
Best advice here would be to select a recording that you know well, and that has vocals dead center and make sure it sounds right and forget about adjusting for other recordings. Not everything is mixed dead center.
You need a listening chair with wheels.
Ha Ha. I listen in my 350 lb massage chair!
You can achieve this with speaker setup it’s just a balance control in DSP.