Guys,
I changed the value of the 3.3V reference divider and now the Empeg runs to a lower voltage before it signals the processor. The battery icon was never the problem, just the audio cutting out. It now seems to run down to @ 10.0V or so before reporting low voltage. This will help me greatly. The biggest problem with the op amp signalling circuit is that it has almost no hysteresis, therefore it senses low battery, cuts out, comes back on, then the voltage rises slightly and the icon goes away. Then with a good bass note or even pushing a front panel button the voltage dips again and the condition repeats. So in other words, just listening, the Empeg can cut out several times a minute if the battery is sitting on the 10.5V threshold. With the divider modification it will still cut in and out multiple times but just at a lower overall voltage which will be just fine for me.

Thanks for all the help.

Nick