Thanks Mike, our local agent who mirrors Farnell only has the TSSOP package, but I might be able to get the SOP package through RS Components who operate here. ( I can solder that one, and the production run is too small to warrant outside assembly )
By the way, I got back to fault finding my faulty unit, and it turned out to be a faulty SD card ( 4 weeks old )
I hope addressing them with only 2 volts data doesn't kill them ! The other 3 units are working fine.
I might change the micro in the audio side of the unit to run from 3v3 to resolve the problem, and use a simple resistor/clamp circuit for the address lines which are very slow.
Thanks again for your time..