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I have a similar need when recording Skype calls. My setup is somewhat different, but the fundamentals should work for your setup. Best of all, you can do it without buying any specialized applications. Rogue Amoeba has a great application called Line In that will allow you to pipe your system's inputs to whatever outputs you are available, including ...

Open Audio MIDI Setup from Applications > Utilities. Click the + button in the bottom left corner and select "Create Multi-Output Device". Check "Built-In Output" (this may already be checked) and the Soundflower output of your choice. Right-click (or control-click) the device you just created and select "Use this device for sound output".