NirCmd Command Reference - changesysvolume

changesysvolume [volume change] {Component} {Device Index}
Increases or decreases the system volume. the [volume change] parameter specifies the number of volume units to increase or decrease (negative value to decrease, positive value to increase).
{Component} is an optional parameter that specifies one of the following sound components: master, waveout, synth, cd, microphone, phone, aux, line, headphones, wavein. The default value is 'master' (for master volume). Under Windows Vista, the component name must be identical to the one of the device names appear in the sound window of Vista (Control Panel -> Sound). If the device name contains spaces, it must be in quotes.
{Device Index} is an optional parameter that specifies the sound device index. This parameter is useful if you have more than one sound card. If you don't specify this parameter, the default sound card in Control Panel is used.
Examples:
changesysvolume 5000
changesysvolume -3000
changesysvolume 0x1000 waveout
changesysvolume 0x1000 master 1

Vista Examples:
changesysvolume 5000
changesysvolume -3000
changesysvolume 0x1000 "line in"
changesysvolume 0x1000 "speakers" 1
changesysvolume 0x1000 default_record

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