Thanks for the great app! I enjoy using it to send voice messages to my wife without using my minutes, but with one problem (a request for enhancement):
Could you add a setting to choose between playing the message out loud (present behaviour, and just like a true walkie talkie would do) or playing it quietly over the phone speaker (as if listening to a phone call)?
My wife doesn't check any voice messages I send her while she's in public because she doesn't like everyone listening in. I think a 'discreet setting' would be a great addition to your already rather cool app!