If anyone is interested I managed to get the Walkman app to change colours according to the album cover, only problem is I am not sure how I did it.
I am on a rooted stock rom with the knox flag 0x0.
I was reading a thread about adding a custom rom without flashing and decided I could use the Walkman and media apps from here:
and simply copy over every file using root explorer.
I ended up having to reflash with Odin the first time but when I did it the second time it worked.
The equalizer doesn't seem to work as I was not very methodical when I did it but it is possible to get it working.
If I get a chance I'll try it again after flashing back to stock and re-rooting so I now exactly what files I transferred, what order and how.
I delete most of the stock Samsung apps when I root so I'll need to do it prior removing anything.
If anyone wants to try themselves feel free just make sure you back up and be prepared to need to reflash if it all goes pear shaped.
Oh yeh I can stream movies via the Sony movie app and pictures from the gallery app from my windows 7 PC too