I'm a little foggy on this, but I thought I read that there is a way to listen to Passport.
Since I don't have anyone in my neck of the woods, I read it and moved on.
This is what I remember:
1. Program each frequency as digital, or MO, or whatever you want to call it.
2. But make the bank conventional.
3. You will hear some data burst, but will also hear the conversations.
Does any of that sound right? This may be all wrong, but that's as much as I can remember about the post I read somewhere.