# OS X Audio MIDI Setup

OS X Audio MIDI Setup is found in Applications > Utilities and provides control of Duet’s sample rate and output level, as well as settings to choose Duet for Mac sound input and output. To control Duet’s output level and muting from AMS or from the Mac keyboard, set Default Output to Duet.

## Setting Sample Rate

Duet operates at all standard sample rates between 44.1 kHz and 192 kHz. In most cases, the sample rate is set by the audio application with which Duet is communicating. For example, when using Duet with GarageBand, Duet’s sample rate is automatically set to 44.1 kHz, to match the GarageBand song’s sample rate. For those audio applications that don’t include a sample rate setting, such as iTunes, Duet’s sample rate may be set in Audio MIDI Setup or on the System setup tab of Maestro 2.

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