ALSA: usb-audio: add front jack channel selector for EMU0204
Add support for front jack channel selector which is present on EMU0204. It allows to get 4 channels out of this soundcard. Tested-by: NYury Bushmelev <jay@jay-tech.ru> Signed-off-by: NVasily Khoruzhick <anarsoul@gmail.com> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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