Mapping ISpMMSysAudio::SetLineId and mixerLineId

[Mots_G]

I want to set the lineId for SAPI by calling ISpMMSysAudio::SetLineId.
I find out the line which I wish to set from the mixer handle I have.
However the line id I get from the mixer is not what SAPI assumes. It
results in SAPI listening to the wrong input line for mic thus getting
no input.

I'm getting the mux control for "DST_WAVEIN" for the mixer handle and
then checking which source line for microphone is active. I wish to
set the active line as "input" to the SAPI.

Thanks