I have an HP2 with the Extreme upgrade. What I'm trying to do is listen to my scanner while it's in Discovery Mode, that way I can hear any new talk groups that may not be in the database. But as far as I can tell the HP2 will only log the talk groups into a list, and you can't listen to the trunked system while it's logging. Does anyone know if this is possible? When I had a Radio Shack scanner this was called "Open Mode" and you could hear every talk group within a trunked system even if you did not have it programmed.