I tried Jaroslav's test project, and I see, that I have
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE. So the problem is not the same. Drivers
are original, from motherboard vendor's CD. soundcard is some Realtec AC'97.
When setting breakpoint in MpCodec_setGain both with 
MIXERLINE_COMPONENTTYPE_DST_WAVEIN and MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE I
see that everything goes ok, mixerSetControlDetails returns MMSYSERR_NOERROR.

Driver vendor not necessarily must include
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE. I think MpCodec_setGain code must be
reviewed, because it is not very platform independent.

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