@gus - if you are still looking - is R13 necessary, seeing as dc coupled from IC1A?
fine - your voltages look what they should be. can you do another short recording, with some playing and some quiet and some switch working? the static might be normal operation. we've heard worse noises.
I can't decide - "1000% elephants!" - Cd'I fans - or - our idiot P.M. - "... a terminological clarification ..."