small signal NPN transitor for muting microphone

I have posted a circuit at this address, please have a look.
http://www.psv.co.uk/MicMute.JPG

What I am trying to do is, mute the microphone by using the transistor as
explained in the circuit. I can un-mute it by closing the switch. All this
works fine on one unit I have modified. I need to modify about 200 units.

My question is, can you see any problem with the circuit?
BTW new parts I will be adding, are:
one 4.7K register, one Transistor, one diode and a switch.


.

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