Got it sorted (I think).
My CD-RW was at node (?) 1,0,0 (Don't totally understand this).
The default in the .conf file was something else (0,6,0 I think for the 'Yamaha') so I changed from the default 'Yamaha' to 'CDROM' and changed the 'CDROM' node position to 1,0,0 (This seemed more elegant than changing the default 'Yamaha' node position?).
When it wasn't working it seemed to be looking for /dev/sg0, I think my CD-RW is at /dev/scd0? I am more than confused actually.
Nevertheless it worked at I don't have to mess with X-CD-Roast which is IMO too intense for just burning a few MP3's.....er which are not all that legal acually but anyway....