"Auto" is a convenience default the radio offers when you use VFO. It kicks in when you scroll through frequencies which are reserved for repeater use: by default, it automatically picks positive or negative offset so that the user doesn't have to set it. It's unfortunate that it saves the duplex setting as "auto" when you add it to a memory channel, and not as the value it actually picks for it ("+" or "-"). The user can always override the default by selecting a different value than the one picked by "auto". BTW, the radio does show "+" or "-", not "auto", on its display. Even worse, this changes by region; it's different between US and EU models (and my patch doesn't do this correctly yet: it uses USA defaults, and I need to make it region dependent).
Yeah, most radios have auto duplex selection. The storing it as auto in the memory channel is the braindead behavior I think.
I'm open to alternatives, and I will leave the final decision to you.
Sending that email mostly crystalized my view that we should _not_ add an auto duplex type to chirp, but glad to have the sanity check. If you don't min exploring the bandplan usage instead of hard-coding things in as you have them here, that'd be cool. If it's not feasible or easy for some reason, let me know.
--Dan