Do you need a mixer?
Reasons for YES
Skype Recording and you do not want to worry if Microsoft is going to pull the API again and you want to be able to do Skype recordings without having to spend anymore money. A mixer comes in very handy for this. you can do what is called a mix minus and that allows for you to be able to record the audio on a separate platform or just to have a backup of the conversation. Mix Minus is...
In audio, a mix-minus is a particular setup of a mixing console or matrix mixer, such that the output to a certain device contains everything except the input from that device. This prevents echoes or feedback from reverberating or howling and squealing through the broadcast or sound reinforcement system.
... Thanks Wikipedia
this is a technique used in not just podcasting but radio too that allows for people calling or skyping in to be mixed into the audio stream but not have to try to talk with their echo coming back at them
Co-hosts you want to have more than o