Hi guys,
Stupid question,BUT, when all else fails, go back to basics.
Are your volume levels up?
Also could be faulty headphone jack.
I had a friend (RIP)had a problem similar,with sound,cannot remember all the details, but was caused by a faulty H/P jack.
Do you have one or two H/P outlets? (These small things have limited functions LOL) but worth a try ?????
Ray
,

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Ray The Saint