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' -------------------- ------------------------------------------------------------------------ bpa's Profile: http://forums.slimdevices.com/member.php?userid=1806 View this thread: http://forums.slimdevices.com/showthread.php?t=104486 _______________________________________________ plugins mailing list plugins@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/plugins