How to set up more than one USB microphone or headset so you can record multiple people each on to their own GarageBand track.
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Check out Using Multiple Mics with GarageBand at YouTube for closed captioning and more options.
NOTE: There is an update to this video. See Multiple Mics With GarageBand.
using the garage band multiple mic configuration, can I use this for skype?
You can try. I’m not sure of the Skype’s application’s abilities to use an aggregate device. Try it and report back.