Many thanks for your continued help ; this command has worked to my satisfaction on about 20 or so audio files I have tried and which are now 'managed' within MB.
While having the opinion that this sort of corrective activity is not exactly what I expected to have to do as a listener to music - having been retired from a quasi-technical role for some decades - I am quite ready to affirm how supportive this forum community is. It is obvious that there is real technical skill in depth here. Thank you.
