Press the button to find the delay using the most recent incoming audio. The resulting figure is displayed almost instantly as a:
Pressing the button activates a delay line in the the source signal path to compensate for the currently displayed delay value, effectively time-aligning source and response signals. Pressing again deactivates the delay line, which allows for quick comparison between uncompensated and compensated signal paths.
If necessary, you can manually adjust the delay figure using either of these methods:
Press the button again to perform a new measurement. This will overwrite any previous value.