If is strange that there is no capture switch and two playback switch
USB Mixer: usb_id=0x046d0a26, ctrlif=0, ctlerr=0
Card: Logitech Logitech B530 USB Headset at usb-0000:00:1d.0-1.2, full speed
Unit: 1
Control: name="Headset Playback Switch", index=1
Info: id=1, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 2
Control: name="Headset Capture Volume", index=0
Info: id=2, control=2, cmask=0x0, channels=1, type="S16"
Volume: min=4096, max=6400, dBmin=1600, dBmax=2500
Unit: 6
Control: name="Headset Playback Volume", index=0
Info: id=6, control=2, cmask=0x0, channels=1, type="S16"
Volume: min=-10496, max=-3072, dBmin=-4100, dBmax=-1200
Unit: 6
Control: name="Headset Playback Switch", index=0
Info: id=6, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
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https://bugs.launchpad.net/bugs/1159687
Title:
[USB-Audio - Logitech B530 USB Headset, recording] Recording problem
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