First time user- editing and old files issue

[Smudger82]

Hi guys first time on here having just bought an Ava media RIPNPLAY which uses subsonic. When I bought the RIPNPLAY and turned it on it still had the "trial" CDs on which I assume had been used by the Ava media team to test the kit earlier this year? Whilst I've now downloaded >150 albums, in the top left corner of the subsonic home page it still lists those original 11 albums which I didn't download. Now whilst I guess that means I've inherited some bonus music my cd's aren't registering there. I still have a full list below of all my cd's but not in the top left corner or in the artwork section.
Secondly I had a few issues with an original ava media player which was replaced. However, I downloaded the same cd several times during these issues and would like to know how I delete the extra copies from subsonic.

Any help gratefully received,
Thanks