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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. |