can't independently adjust Mic levels

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hi all,

so, i got my asus xonar dx and installed it into my system with alsa
1.0.17 and linux 2.6.27-14-generic.  the documentation indicates i need
alsa 1.0.18 or linux 2.6.26.4, so i figured my setup is already OK and i
didn't do any extra configuration. (i'm new to this ;))

the problem i am running into is i cannot independently adjust the left
and right levels of the Mic capture.  well, i can, kind of, but it
doesn't have any effect.

for example, when i use alsamixer and use up/down arrows on the Mic
levels, the level of the Mic is affected.  so, that part works 100%

however, when i try to adjust the left channel using q and z, it has the
same effect of using up and down (thus adjusting both channels)

and, when i try to adjust the right channel using e and c, it will
appear to adjust the right channel only, as i would expect.  however,
this doesn't have any effect on the actual volume of the (right channel
of the) mic at all.

i tried another approach using amixer.

for example, 'amixer -c 1 set Mic 20%,70%' produces:

Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 7 [23%] [-24.00dB] [on]
  Front Right: Capture 22 [71%] [-1.50dB] [on]

indicating the command was successful.  however, running 'amixer -c 1
get Mic' right after produces:

Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 7 [23%] [-24.00dB] [on]
  Front Right: Capture 7 [23%] [-24.00dB] [on]

alternatively,

$amixer -c 1 set Mic 70%,20%
Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 22 [71%] [-1.50dB] [on]
  Front Right: Capture 7 [23%] [-24.00dB] [on]
$ amixer -c 1 get Mic
Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 22 [71%] [-1.50dB] [on]
  Front Right: Capture 22 [71%] [-1.50dB] [on]
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