Hello Folks   After a change of SD card, to one which doesn't have 'error' music files on it, my Amundsen still has music on it (including the 'error' files it can't use) which is not on the the SD Card that's now in it.  I've had a rummage and read the manual, but I'm not finding the answer as to how to get the old stuff off.  Is is obvious, what am I missing, anyone know how to do it?   Ta   Gaz