Unfortunately I dont have an empeg handy for the next couple weeks so I cant test this out.
This may be totally obvious, and if it is I am sorry, but does the empeg show the current mode in the menu, or does it always start at off, regardless of current setting. Do you actually select the 'off' setting, or do you just exit the menu as it looks like it is already set to 'off'. Once again, sorry if this is obvious, I dont mean to insult, just something I though of.