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GarageBand offers a variety of ways to record music. Software Instrument tracks use sounds generated by your computer, using prerecorded samples or models of different instrument types; Real Instrument and Electric Guitar tracks require you to plug an external sound source (such as a microphone or an electric guitar) into your Mac. Electric Guitar tracks also give you access to GarageBand ’11’s many amp models and stompboxes.
To use this Quick Start section, choose the heading that describes your situation or your interests. Then, follow its suggestions. However, I recommend reading through the entire book to get the most from your GarageBand experience.