ATC Labs Perceptual SoundMax Q24 Operation Manual page 26

Figure 3.9: Diagnostic Screen
To diagnose each path with built in test tone follow these steps:
Select any one of the path form Digital/Analog/Composite FM option.
Press Playback key
Now select option from Tone/Sweep/Pink Noise. In case of Tone,
fundamental frequency can vary from 1 kHz to 24 kHz. User can also
configure Start and stop frequency in case of Sweep tone.
Loopback
Press GO LIVE key to get back into 'Processing' mode.
A T C L a b s C o p y r i g h t ( 2 0 1 2 ) A l l R i g h t s R e s e r v e d . Page 26