Audio Monitoring - 5.1 Mix Room

The iMac has built-in speakers, a built-in microphone and a MOTU16A audio interface.

Most applications are configured to use the MOTU 16A audio interface.

Grace m906 Monitor Controller

The m906 Grace monitor controller is used to select audio sources and to adjust the volume.

Main Volume Knob

• The big silver knob on the lower right is used to set the volume.
  • Double click the main level knob
    • This will set the volume to 65dB
    • adjust as needed

Analog Input Buttons

• On the top left are the analog input select buttons:
  • CPU = MOTU 16A audio interface
  • Blu-Ray = Blu-Ray player
  • Mixer =. small mixer on top of the equipment rack

Channel Solo/Mute

• The channel solo/mute buttons can be used to solo or mute specific channels.
• The solo/mute button on the right sets the mode.
  • When green the buttons are in solo mode.
  • When red the buttons are in mute mode.
• Press the channel buttons to solo or mute a specific channel.

Speaker Select Buttons

• On the lower right are the speaker select buttons
  • 1 = the Yamaha receiver
    • Audio will play through the speakers selected on the Yamaha receiver.
  • 2 = Nearfields
    • Audio will play through the speakers on the computer desk

Other Buttons

• Mono: press down to monitor in mono.
• Dim: pressing the button lowers the volume by 20dB
• Mute: turns the volume all the way off.

Speaker Levels

There is a Mackie Big Knob volume control box to the left of the iMac

1. Start with the output level down
   • The silver knob is turned all the way to the left
2. Set the Source Select button to A to select the MOTU 828 output.
3. Start playing sound in an application.
4. Slowly turn the silver knob to the right to increase the volume.