Thanks for that. WHat did the upgrade look like is it a removable card - or does the unit just remember more because it was modified internally. If it is a removable card any idea what chipas are on it if they're visible. Sorry to ask all these pesky questions about a historic item, but I reckon I can make up a memory expansion - I like to mess with stuff see my Peavey PC1600 memory hack at http://www.gozen.demon.co.uk/godric/godric.html look under the synth pebble.