Banana PI M1 built-in microphone features

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i would like to obtain information about Banana PI M1 built-in microphone features. It would be nice to know its maximum sampling frequency (I know it samples at 44100 Hz, could it get any highter?) and i also require (if existing) some frequency response charts. Is there such a thing like an expansion (addon board) microphone for this device. Could an usb microphone work? If I install Android on this device, could i access to the microphone features with a customized app for this purpose? Thanks

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