And you can try them out on your Vintage Keys before you replace the battery. But if the battery was the problem then you'll have to do the same thing each time after you power off. But I'd still go ahead and try them out anyway.

The PC version of Freeloader also has sysex record which is useful if you ever tweak the patches yourself. You can send the patches back to the PC so you can keep a backup of your own customized patches in case the problem occurs again.