# Setting Speaker and Headphone Output Levels

Between the front panel encoders, level controls in Maestro, and Mac hardware and software level controls, there are several ways to control speaker and headphone output levels.

## Front Panel Encoders

By default, the front panel OLED Display presents the necessary controls to select an output and set its audio level.

- Once Symphony I/O has completed its power-up sequence, turn the left hand encoder to select the speaker outputs, headphone output 1 or headphone output 2.

- Turn the right hand encoder to set the audio level. The audio level is expressed in dBs of attenuation from full level, i.e “-20 dB”.

- Mute the speaker and headphone outputs simultaneously by pressing the right hand encoder.

## Maestro Level Controls

Speaker and headphone output level controls of each peripheral may be controlled from knobs in the Output tab window.

Speaker and headphone output knobs found in the Toolbar offer immediate access to the level controls of a selected peripheral, regardless of the Devices sidebar or tab selections. By selecting the peripheral to which your speakers are connected, you can quickly adjust output levels without the need to display that peripheral's Output tab window.

## Mac Keyboard

Follow these steps to use your Macʼs keyboard volume and mute keys to control Symphony I/O output levels.

> 1. In OS Xʼs System Preferences > Sound, select Symphony 64 as the device for sound output.

> 2. In Maestro's System Setup Tab window select the Symphony I/O to be controlled in the Keyboard Volume Control > Peripheral drop down menu.

> 3. Select the specific output in the Audio Output drop down menu.

As an example, consider a system consisting of two Symphony I/Os, A and B. To control Symphony I/O A's Headphone 2 output from your Mac keyboard volume controls, set Keyboard Volume Control > Peripheral to A Symphony I/O and set Keyboard Volume Control > Audio Output to Headphone 2.

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