Volume section defines a volume curve for a given use case and device category. It contains a list of points of this curve expressing the attenuation in Millibels for a given volume index from 0 to 100. 0,-9600 100,0 It may also reference a reference/@name to avoid duplicating curves. 0,-9600 100,0 Comma separated pair of number. The fist one is the framework level (between 0 and 100). The second one is the volume to send to the HAL. The framework will interpolate volumes not specified. Their MUST be at least 2 points specified.