One of the easiest ways to do interviews, or to have a co-host for your audio podcast is to call the other person on Skype, and then record the audio coming out of Skype along with your own microphone input. I’ll demonstrate how to do this using WireTap Studio. Skype is a free application and service that allows you to make computer to computer calls for free, or from a computer to a regular telephone for a very small fee.