2010/10/23 Colin Guthrie gmane@colin.guthr.ie
'Twas brillig, and Raymond Yau at 23/10/10 12:51 did gyre and gimble:
Is this the reason why kmix remove the left/right balance control ?
Not sure what you mean by this... kmix can still control left and right independently... just right click and chose "split channels".... but perhaps I've misinterpreted what you are saying.
Col
Not sure that your case are similar to the issue described in table 2 of stac9200 errata and known issues since alsamixertest use a mono sine wave with sample rate 48000Hz the recorded signal is also mono through plughw, so it is unlikely for alsamixertest to know whether there is a phase shift in the left channel
There is a change in DAC sample rates since PA use 44100Hz to probe your codec and alsamixertest use 48000Hz to play the sine wav
Changes in the DAC sample rates between 44.1 kHz multiples and 48 kHz multiples can cause attenuation and phase shift in the left channel of the DAC
S/W workaround exists, but doesn't provide 100% coverage. The only totally effective method is to lock the sample rate to a given value.