I can confim that this works on James Meija Rom but you must follow the instructions carefully. It involves adding to build prop and making sure you have enough space in system memory (at least 75mb for all features). I have not tried every thing just the walkman from experia v plus clear audio and enhancements. I had to remove a couple of apps from the system using Link2sd to make sure i had enough space (music+, browser as i use opera anyway ect) obviously dont remove anything needed by the system. Other roms may have more free system space (slim).
Sound quality is awsome and has a really pretty Visualiser. It doesn't seem to have a control widget but controls are in pulldown and on lock screen when minimised.
It also installs Experia launcher but i have not tried this i just froze it with Link2sd as not to cause any conflicts and everything still works OK.