Sweetnothing
¯\(º_o)/¯
Guitardrummer's (creative name there) question is perfectly valid IMO, and I'm sure more than one producer uses a third (or fifth) rhythm track low in volume up the centre. I've never done it personally though.
Terry Date did that on cowbows from hell, vulgar display of power and some prong records, at least that's what he said on several interviews.
I don't think it's a bad technique, but then again, depends on the material, band, etc