Yup Wave Music, that is her all right
She was one of 2 slightly identical sisters - the other one was SOUND OF SCARBA (ex-Ölandssund III).
SOUND OF SCARBA was sold to private interests who renamed her SOOND with the intention of running her as a hippy "new age" commuter ferry with a difference (don't ask me what that means
) across the River Thames in London.
Following a long and complicated conversion in Greenock, which saw glassed canopies built over her car deck, she finally took up her new role and has since been since renamed SOUND (still with her current owner) but since 2007 I've not been able to find out any more information about her current role. I'm not even sure if she is still running or what she is supposed to be doing.