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Meters

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[The feature associated with this page, Audio Mixers, is a legacy feature. It has been superseded by Volume Controls. Volume Controls has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Volume Controls instead of Audio Mixers, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The meter controls measure data passing through an audio line. These controls use the MIXERCONTROLDETAILS_BOOLEAN, MIXERCONTROLDETAILS_SIGNED, and MIXERCONTROLDETAILS_UNSIGNED structures to retrieve and set control properties. The following table describes the types of meters.

Control Description
Boolean Measures whether an integer value is FALSE/OFF (zero) or TRUE/ON (nonzero).
Peak Measures the deflection from 0 in both the positive and negative directions. The range of integer values for the peak meter is –32,768 through 32,767.
Signed Measures integer values in the range of –231 through (231 – 1). The mixer driver defines the limits of this meter.
Unsigned Measures integer values in the range of 0 through (232 – 1). The mixer driver defines the limits of this meter.