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The Audio Driver
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Audio level
This control sets the hardware Input Reference level and software-based Boost factor. The settings are
separate for each input of each device, and are applied to whichever input is selected in the current
application or in the system mixer. The settings displayed do not automatically update when you change
inputs in the application or mixer click update to refresh the settings.
In Figure 72, the Audio Level control is different depending on which input is selected.
The Input Reference level is meaningful only on the analog unbalanced and balanced inputs, and is
calibrated differently for each when a digital input is selected this control is disabled. This is a hardware
gain control with the default level chosen such that the expected amplitude of a full volume input signal
will have adequate headroom without clipping. If you do experience clipping, or are working with low-
level signals, you can adjust this level. On this control, a higher reference level results in lower gain, so
the quietest setting is at the top of the scale. Click Default to restore the default value.
Figure 74. Input reference level
The Boost setting is a software gain adjustment that applies to both analog and digital inputs. You can
set Boost individually for each input. It supplements the system mixer volume controls by providing a
wide adjustment range. You can use it to calibrate or normalize input levels across multiple inputs; or to
accommodate microphones or other non-line inputs that have nonstandard signal levels. Again, Default
restores the default value.