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ALSA: usb-audio: Support changing input on Sound Blaster E1
The E1 has two headphone jacks, one of which can be set as a microphone input. In the default mode, it uses the built-in microphone as an input. By sending a special command, the second headphone jack is instead used as an input. This might work with the E3 as well, but I don't have one of those to test it. Signed-off-by: Ian Douglas Scott <ian@iandouglasscott.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Unless I am missing something obvious, what is the special command that can be sent?