Hi, Jim-
I'm yet to see an ESU sound file where F1 is the default startup command, so that has me scratching my head. Isn't F1 always the default bell command?
Otherwise, with the going to notch 8 thing, is it possible that F26 (notch up/run 8 ) is somehow already active when you power up your DCC system?
On my system (MRC Prodigy Express), if I disconnect the throttle with certain commands active or there's a power interruption, those commands will be active every single time I power up my system, until I unplug the throttle again with those commands off.
That said, I've only experienced an unwanted active command upon system startup with a single unit, not several units (although I suppose several units could be affected if that command is assigned to a consist).
...actually, I know this can happen with all units assigned to a consist, as it isn't too uncommon for a consist of mine to not move when I throttle up right after powering up the system, until I activate and then deactivate F9 (drive hold).