Good question. I will double-check that this evening, but my recollection (and my OCD tendencies back this up... I
always return volumes and filters to zero, and the switch to standby) are that the ghost signal was there, however faint, while both volumes are all the way down. I remember thinking; wait a minute - the switch is in standby, should be no output. Yet, there it was. It's not enough to be usable, but it is enough noise to not be mute. (which is kinda' what I use the switch for) Shouldn't be there at all...
It would make a dandy 20' jump-rope too... kind of a bright-side thing I'm doing today.