Please go through these steps to ensure that everything is set up properly:
Setting up ONE's inputs
Internal Mic: To use ONE's built-in internal mic, launch 'Apogee Maestro' from your Applications folder, go to the 'Input' tab and click on the 'Analog Level' drop-down menu for Input 1 and set it for 'Int Mic'. Gradually bring the input level in Maestro up until you get a good level from your input source. Make sure the meter isn't going into the red.
External Mics: Connect your Mic using only an XLR cable (no 1/4" adapters or cables) to the XLR input 1 of ONE's breakout cable. Launch 'Apogee Maestro' from your Applications folder, go to the 'Input' tab and click on the 'Analog Level' drop-down menu for Input 1 and set it to 'Ext Mic'. If you're using a condenser mic that requires phantom power, choose 'Ext Mic 48v'. Gradually bring the input level in Maestro up until you get a good level from your input source. Make sure the meter isn't going into the red.
Guitars, Basses, Keyboards, Hi-Z Mics that have 1/4" cables, such as harmonica mics: Connect your Instrument using only a 1/4" instrument cable to the 1/4" input 2 of ONE's breakout cable. Launch 'Apogee Maestro' from your Applications folder, go to the 'Input' tab. Gradually bring the input level in Maestro up until you get a good level from your input source. Make sure the meter isn't going into the red.
Setting up ONE's outputs
Using ONE with DAW or audio playback software: Launch 'Apogee Maestro' from your Applications folder, go to the 'Output' tab and set the output to 'Out 1-2' (the drop-down menus under the software output knob) - Confirm that the mute button isn't engaged in Maestro's output tab.
Using ONE without any software- input directly to output: Launch 'Apogee Maestro' from your Applications folder, go to the 'Output' tab and set the output to 'Mixer' (the drop-down menus under the software output knob) - Confirm that the mute button isn't engaged in Maestro's output tab.
Here are some videos on how to set up ONE with Garageband:
For Mac: https://vimeo.com/103957400
For iPad/iPhone: https://vimeo.com/103957401