Bob.

assuming your plugging the phones (which i'm assuming are pro studio phones with qtr inch male connector ?) into a mini jack of sb via a qtr inch to mini jack gizmo....are you ?
and assuming youve unplugged and plugged into the sb jack input oodles of times over the years ...try this.
just some ideas...
1. try a different set of eg dollar phones with mini jack male plugged into sb mini jack phone input...DO YOU NOW HEAR STEREO in the dollar phones ? AND //OR
2. make sure you seat into the sb phones input properly
cos ive found with repeated use 'sometimes' mini jacks can be problematic with repeated/gazillions times of use.
ie it might purely a sb jack prob.

if not above then i'm out of ideas. assuming your pro phones work in other gear.

om

Last edited by justanoldmuso; 06/28/22 01:55 AM.
my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)