Important correction from the developer to address one of my cons: You can, indeed, run two instances of Rewind on Windows to record both system audio and live audio. Unfortunately, running two instances is not yet possible on Mac.
Heads up, the newest update of Rewind needs to access your entire screen and audio recording on OSX. It didnt before this last update. First thing you wonder is why an audio capture software is recording my entire screen when in use? And why does it no longer fully close when i quit the app but leaves the app running in my task bar where i can see the screen recording still going. Thank goodness for OSX not letting that stuff just unknowingly fly.