Yeah Lou, obviously resonance exists, but DD suggested it would affect the Frog reed valves, and it was that statement that surprised me.
Plus the fact that most people's experience with reed valves is limited to Cox 049s, and they're so specific and inconsistent anyway that one couldn't base much assessment on running BabeBees.
I've only ever built one twin (in 1963!), a CL scale Catalina with one Oliver Tiger and one PAW 2.49. I certainly don't recall any problem due to resonance...