I've noticed with looping that things can tend to get a bit muddy, especially so with bass. Is there a way around this perhaps? Looping parts only if they're higher up the neck? Having more of a scooped tone overall for clarity? What do you more experienced loopers do to reduce the mud when looping?
Some combination of: (1) Different registers, as you suggest (2) Different effects (e.g. clean base + dirt overlay or vice versa) (3) Different phrasing between parts (play your overdub in the "void" of the base loop)
Pretty much the same as with any type of recording. Don't use a bedroom tone. Lots of high mids, don't boost the low frequencies. Things like that.
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