Audacity Forum

Another possibility is to get a cheap mixer board (check ebay). You can get one that connects to your USB port on your computer, and then you can connect two (or more) mics, and other ext sound sources if you want to add other audio (such as music)

You would benefit from purchasing an inexpensive mixer. You could then run sound input and output from your laptop to the mixer and connect the mixer output to your H2 (this may vary according to the brand of mixer you purchase). Then connect a microphone to the mixer, connect your earphones to the ...