preamp topology

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Preamplifier Under Micro Controller Control

So i think that i would like to place the pre amplifier under micro controller control. I would really like to know what features i would have to change/ include to the exisiting pre amplifier system to make allowance for the a complete pre amplifier operating under a PIC controller.
 
I would like to incorporate a PIC controller to operate the pre amplifier. If this was to be performed on lineup's pre amplifier, what would be the changes that would have to be made to the system above and how would a PIC controller be implemented? The controller would be used for the usual things such as mute, volume control,bass, power etc.
 
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