I'm really surprised that the mic input is DC coupled. That's _very_ odd. But then I've not seen the schematics (anyone got a link?), so maybe it is. I'd cer

I'm really surprised that the mic input is DC coupled. That's _very_ odd. But then I've not seen the schematics (anyone got a link?), so maybe it is. I'd certainly consider a low power rail-to-rail op-amp and dump the 9V batteries.