Every 7-string jazz guy I've know has used a low A, not a low B. Low B is for the rockers like Steve Vai.
It's so you can just take chords on the ADGBE set and just move the bass note down an octave without changing your fingerings. It's actually a pretty
easy adjustment.
An interesting tuning I came across is tuning the (regular) A string an octave higher, which turns most chords into close position voicings instead of
open.
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