It's always fun to hear or see women comparing photos of penises cut and uncut and how they look and feel in the womens' hands, mouths and vaginas.
I'm always curious to hear how women feel about the circ scar and how it compares to a natural dick.
You can just plug any cheap mic that you buy at Walmart or Radioshack into your desk top or lap top and then record using windows recorder found under the accessories menu or any freebie program that you can download. Most USB webcams these days have built in mics and can be bought online at Amazon or Tiger Direct for twenty bucks for a basic model.
I'm sure that there are iphone aps for recording audio to MP3 but I can't tell you which is the best because I'm a Nokia man.
HTH and please let me know what OS you're using so I and others can make some better recommendation for free software etc.