Audio Attributes

The OS/2 ampmix device provides the following control of audio signals. Current values of audio attributes are retrieved using the MCI_STATUS message. New values are set using the MCI_SET command.

Support of these features can vary by manufacturer. Some companies may develop ampmix devices for use in OS/2 multimedia that provide additional capabilities. To determine whether the device supports a feature, use the MCI_GETDEVCAPS message. If the feature is not supported, MCIERR_UNSUPPORTED_FLAG is returned.

volume

Sets mixer-channel volume level as a percentage of the maximum achievable effect. Volume of the left and right channels for stereo signals can be set simultaneously using the keyword all, or independently using keywords left and right. The keyword over can be added to fade the volume in or out over a specified period of time.
treble
Sets treble as a percentage of the maximum achievable effect. The effect applies to the final output mix. Any specification of a channel is ignored.
bass
Sets bass as a percentage of the maximum achievable effect. The effect applies to the final output mix. Any specification of a channel is ignored.
balance
Sets balance. Zero is full left balance, 100 is full right balance. The effect applies to the final output mix. Any specification of a channel is ignored.
pitch
Sets pitch as a percentage of the maximum achievable effect. The effect applies to the final output mix. Any specification of a channel is ignored.
gain
Sets gain as a percentage of the maximum achievable effect for the currently selected input.
monitor
Sets monitor on or off. This feature controls whether or not the signal from an input device is heard when it is routed to another device for recording.
mute
Sets mute on or off.
loudness
Sets loudness as a percentage of the maximum achievable effect.
mid
Sets mid as a percentage of the maximum achievable effect.
reverb
Sets reverb as a percentage of the maximum achievable effect.
auto level control
Sets auto-level control (ALC) as a percentage of the maximum achievable effect.
chorus
Sets chorus as a percentage of the maximum achievable effect.
crossover
Sets crossover as a percentage of the maximum achievable effect.
custom1
Sets first custom effect as a percentage of the maximum achievable effect.
custom2
Sets second custom effect as a percentage of the maximum achievable effect.
custom3
Sets third custom effect as a percentage of the maximum achievable effect.
stereoenhance
Sets stereo enhancement as a percentage of the maximum achievable effect.

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