See pictures below. I bought a bunch of these on Ebay they work pretty good. But the microphone is low quality. What I want to do is ditch the microphone and use the headphone jack on my computer as a source to record sound. I believe I can remove the microphone and R3 and attach the input directly to C4. As I understand it I might need a voltage divider to attenuate the signal from my headphone jack but I have no clue how to do it or the resistor values. Could I just use a very low volume on my computer instead? Do I need a resistor to match impedance?