You can do this easily by using the Alexsis Multimix 6FX, which sells for about $100. It's a full stereo mixer, with effects. You can fire the mic through the mixer, then run it trough the effects loop and output it to another channel. Then using the pan controls, pan it left for one channel, and right for the second channel. Additional outputs can be utilized from the headphone and Control RM outputs.

Good Luck,

Gary