Yes, they just may not make sense... since Passport is a form of trunking you may hear multiple different conversations on different talkgroups back to back on the same frequency, and you'll have no way of telling them apart other than by ear. Also Passport frequencies usually send out an idle burst every 3-5 seconds that sounds like a click as the repeater keys up with dead air, and this can get pretty annoying.
I recommend programming all the frequencies for the site you want to listen to with delay turned OFF (so it won't get stuck on a frequency's idle burst). Then if you're trying to follow a conversation that left the channel, just keep scanning to find it again.