Thank you, BradMZ, for answering my queries of Nov 11, though the answers ended up being more complicated than I would have wished. I now have another: is installing custom stage settings dependent on updating firmware? My PX-5S is new, and I have not yet loaded anything. I want to make use of MM's ALL file v 2.5 but I don't want to install 1.13 firmware due to forum posters' qualms. I must use a thumb drive as my iMac is in an office in another part of my home and is physically inaccessible for direct connection to the PX-5S. So, will custom settings work without at least 1.12 preinstalled? Thanks for your attention. This forum is terrific.