So I recently began to record a podcast with a friend and we use a Plantronics .Audio 655 headset and Blue Snowball microphone for my and his voice, respectively. He uses the Blue Snowball microphone on its 1st setting (a cardiod directional recording pattern). However, even as such, the microphone picks my voice up from time to time, such that I get an echo on the track that sounds bad and has to be manually deleted afterward. Sometimes a sound gate can get this and remove it, but not always. My question is whether there is something I can do with software to alleviate the problem (I am currently using Garageband, but I am interested in upgrading to middle-of-the-road software), or it is solely a hardware thing. Our set up consistes of us sitting in a room about 3 to 4 feet apart.