Hi Jack,
I thought all the line issues (when considered as a
voice line) had actually been resolved. To reinforce what
RobertoS has said, when performing a quiet line test you should only notice a "
presence", that is to say the electrical circuit has continuity, i.e. it is
"alive". There should be no loud hiss, rustling, humming, buzzing, clicking, crackling, etc.
It is unfortunate that we are not able to share audio in the way that you showed us the pictures, in your other post.
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100% Linux and, previously, Unix.