Many thanks Leslie.
I'll take your advice as the B2 will NOT compress the wav files which I ripped on my old PC.
I mentioned the PC was running Windows 7, just to show the age, i.e. @ 9 years!
I have access to a later computer running Windows 10, and will rip to flac.
As you can see, I'm pretty well software illiterate, not knowing all the detail.
By waiting 2 years before I updated from my JB7 to the B2, I had hoped any software *bugs* would have been sorted....
but evidently not! As others have said, a learning project....
Really happy otherwise with the B2, big advance on the JB7 due to the web UI, (and the smart phone ap looks useful).
Makes access to the music much easier, which is of course the only reason for purchase.
[The JB7 was a good idea, but a bit off a trachle (good Scots word)]
Thanks again to everyone for their input.
Colin