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ezdsp5535 aic3204 microphone in problem

I have successfully tested AIC3204 linein function. I still can't get my electret microphone working with it. I have searched for previous posts and learned about bias power supply. From ezdsp5535 schematics, I notice that PIN19 MICBIAS of AIC3204 is actually connected. So electret mic should work, right? Can someone help me with that?

Thanks,

LG