## MMPM/2 Device Driver Reference

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### AUDIO_CONTROL (42h) - Control Audio Adapter

Category:
AUDIO_IOCTL_CAT (80h)
Function:
AUDIO_CONTROL (42h)
Description:
Control Audio Adapter

Select an item:

    Description
    Parameter Packet Format
    Data Packet Format
    Returns
    Remarks

This IOCtl is used to change the state of the adapter or selected characteristics of the adapter. The adapter state is changed by the following usIOCtlRequest values:

AUDIO_START (Not required for MMPM/2.)
AUDIO_STOP (Not required for MMPM/2.)
AUDIO_PAUSE (Not required for MMPM/2.)
AUDIO_RESUME (Not required for MMPM/2.)
AUDIO_CHANGE

Adapter characteristics are changed by the usIOCtlRequest value AUDIO_ CHANGE.