The -V will use the ALSA controls but not all USB devices have lots of
controls - some may not even have a volume (i.e. device just converts
PCM to audio - volume control is done on PCM samples not by USB device)
To check whether the USB DAC present any control use the amixer command
. Example below a cheap USB sound device with Mic and Headphone socket
on card 2
You can see the volume control is via a Mixer and also a "Switch" is
implemented.
Code:
--------------------
$ amixer -c2 controls
numid=10,iface=CARD,name='Keep Interface'
numid=5,iface=MIXER,name='Headphone Playback Switch'
numid=6,iface=MIXER,name='Headphone Playback Volume'
numid=3,iface=MIXER,name='Mic Playback Switch'
numid=4,iface=MIXER,name='Mic Playback Volume'
numid=7,iface=MIXER,name='Mic Capture Switch'
numid=8,iface=MIXER,name='Mic Capture Volume'
numid=9,iface=MIXER,name='Auto Gain Control'
numid=2,iface=PCM,name='Capture Channel Map'
numid=1,iface=PCM,name='Playback Channel Map'
--------------------
------------------------------------------------------------------------
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