as far as i can see, if you're mic is selected to record in your computers mixer but playback is muted, then it shouldn't feed back.... as long as you are not routing the adc to the dac to play back directly, i think if you are using it as a control signal or recording into arrays then playing that back then it should be ok....
if you're looking for direct monitoring or output from the mic without feedback then you could try repositioning your mic and speakers... or wearing headphones.. hope this helps adam
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