Soft dB Opus Suite Building Acoustics Module Airborne Sound Isolation between Rooms ASTM E 336_ISO 140-4 - Manual (Page 15)

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Level Measurement Setup
The unit can be used to generate a pink noise or a white noise. The
output signal is balanced on output 1 and output 2.
If an external generator is used, the source type can be set to external.
This disables the outputs.
When an internal generator is used, the volume can be adjusted from 0
to 100%.
The average period of the two types of level measurement can be
adjusted independently.
The average type of the two types of measurement can be adjusted
independently. It can be adjusted to be a plain average (Leq) or a
statistic level (Lx%).
Using the statistics instead of the Leq can minimize the punctual noise
events that may occur during a measurement (especially for the
background noise).
The Ymin and Ymax parameters set the vertical scale (levels in dB) of the
spectrum graphs of the current module.
Reverberation Measurement Setup
The unit is used to generate a pink noise or a white noise. The output
signal is balanced on output 1 and output 2.
The volume of the internal generator can be adjusted from 0 to 100%.
The measurement length is the duration of the noise emission of one
iteration of the reverberation evaluation.
The number of average is the number of iterations used for the
reverberation evaluation.