USING GENERATORS
Both Real and Software Instruments in GarageBand use a combination of several effects as part of the instrument. Software Instruments also have another component called generators that create sound that Real Instruments don't possess. A Software Instrument's generator is responsible for actually creating the basic sound characteristics of a particular Software Instrument. That basic sound is then modified by its effects settings, just like a Real Instrument.
GarageBand includes 18 powerful generator modules with which to build instruments, as well as a “bonus” generator that has been on your Mac since QuickTime 5.
But wait, there's more! You can even use third-party Audio Unit instruments as generators in GarageBand. Not bad ...
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