but there are three capture subdevices which allow user to capture from
three input sources independently

**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 3/3
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2

Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Internal Mic' 'Mic' 'Internal Mic 1'
  Item0: 'Mic'
Simple mixer control 'Input Source',1
  Capabilities: cenum
  Items: 'Internal Mic' 'Mic' 'Internal Mic 1'
  Item0: 'Mic'
Simple mixer control 'Input Source',2
  Capabilities: cenum
  Items: 'Internal Mic' 'Mic' 'Internal Mic 1'
  Item0: 'Mic'


Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch penum
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 14
  Front Left: Capture 12 [86%] [18.00dB] [on]
  Front Right: Capture 12 [86%] [18.00dB] [on]
Simple mixer control 'Capture',1
  Capabilities: cvolume cswitch penum
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 14
  Front Left: Capture 14 [100%] [21.00dB] [off]
  Front Right: Capture 14 [100%] [21.00dB] [off]
Simple mixer control 'Capture',2
  Capabilities: cvolume cswitch penum
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 14
  Front Left: Capture 14 [100%] [21.00dB] [off]
  Front Right: Capture 14 [100%] [21.00dB] [off]


pulseaudio does support multiple sinks/sources (e.g. audio 4J which has 2 
playback and 2 capture subdevices )


ARECORD

card 1: Audio4DJ [Audio 4 DJ], device 0: Audio 4 DJ [Audio 4 DJ]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1


http://git.0pointer.de/?p=pulseaudio.git;a=blob;f=src/modules/alsa/mixer/profile-sets/native-instruments-audio4dj.conf


[Mapping analog-stereo-a]
description = Analog Stereo Channel A
device-strings = hw:%f,0,0
channel-map = left,right

[Mapping analog-stereo-b-input]
description = Analog Stereo Channel B
device-strings = hw:%f,0,1
channel-map = left,right
direction = input

[Profile output:analog-stereo-all+input:analog-stereo-all]
description = Analog Stereo Duplex Channels A, B (Headphones)
output-mappings = analog-stereo-a analog-stereo-b-output
input-mappings = analog-stereo-a analog-stereo-b-input

-- 
pulseaudio should handle additional mixer element name for internal mic
https://bugs.launchpad.net/bugs/680810
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