The voiceover configuration in this room consists of a Rode microphone system, preamp, and Apogee Duet 2 sound card/audio interface.

Step 1) The Avalon Pre-Amp should be set to a base level DB setting of 30 using the level knob on the left of the unit:

Step 2) Make sure the Apogee Maestro software is open the and Duet 2 hardware is detected. When the computer is turned on the Apogee Duet 2 will automatically power up and the Apogee Maestro 2 software will automatically open. If it is not open, you can click on the program icon in the Dock , or simply restart the computer.

The Apogee Maestro 2 software will show you if the device is connected (red arrow pictured below) and also will show you the volume level on the mic 1 input channel. If the Duet 2 device does not appear on the left-hand side, either restart the computer, or unplug the USB cable on the back of the Apogee unit and re-insert it.

Step 3) This device should also be set to 30 DB as a starting point and adjust as needed from there (will depend on the content being recorded):

Step 4) Speak a few words into the Mic and make sure the levels are visible on the meter as you speak. If the Mic is too hot/loud (for example, levels are going into red or yellow area at the top of the meter as you speak) you can adjust the volume DB to a lower value:

Step 5: Now you can try using Audacity to record a simple voiceover.

For monitoring the the audio recordings, audio will by default play back through the speakers in the room. If you would prefer to use headphones, be sure to use the headphone port located on the Apogee unit:

NOTE: Because the Apogee Maestro software has all the necessary controls on it there is no need to adjust the buttons or control knob on the Apogee hardware device itself. If you would rather use the hardware button(s) to control the device, there is a comprehensive manual available.
Click here for the manual for the Apogee Duet 2. Page 9 addresses adjusting the mic input or headphone input/output levels specifically.