It is a free piece of software for Mac OS X by Cycling74 that will let you route system audio within your Mac. When a situation arises where you want to record the audio along with your screen recoding on your Mac, you could try raising the volume on your speakers and hope that a built-in microphone captures that audio, but that's far from elegant. Quick tutorial on Soundflower in Quicktime from CNet It is extremely good, but comes at a price. Rogue Amoeba have always had their own system for intercepting Mac audio & routing it to chosen destinations, but their app, Audio Hijack, is not free ($50) This has been traditionally done using a freeware app called Soundflower - originally by Cycling 74, taken over by Rogue Amoeba but not developed or supported further. To record "in-computer" sound, you need software that can re-route audio within the Mac itself - to make it think an output is actually an input. To add external audio sources, you need to make sure the correct input is assigned before you start the recording
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