[Atavax]

I am currently using a Audio Technica AT2020USB+ microphone. I am seeing noticeable mouse performance improvements by reducing the number of devices running on USB ports and want to try to get my microphone off if its USB port.

 

[Ari33]

I dare say its possible but there are no guarantees the results will be favourable. The only way to plug a USB mic into an analog input, without using a host device, is to discard the mics own ADC convertor and modify the microphone to directly access the analog signal from the mic capsule.
 
 
 
 
See http://www.instructables.com/id/How-to-convert-a-Rock-Band-USB-microphone-to-a-14/
 
 
 
 
You'd probably be much better of not making your USB mic worthless and just buying an analogue mic.