the setting i have for my gre psr 800 on the philly system i got from clicking the library import tab at the bottom of the screen in the ez scan program.
you can start over to import it with the current settings by clicking the advanced menu at the top and selecting show trunked, click the trunked systems tab at the bottom and deleting the philly system, then click library import, (i found it by clicking systems).
when you say the philly system sounded like noise, did it sound like static or more like garbled voice? as you might know that system using simulcasting with lsm, so you'll probably need a yagi to get a signal from one of the towers and reduce the interference from the other towers transmitting on the same frequency at the same time