Hi Harry, Hi Ralf,
Thank you for the fast answers.
Harry, in fact you did not quite answer question 1 : do I have to use hdsploader ? Put it another way, would the card be recognized if the firmware is not ok? This firmware question is not clear for me : I fear to corrupt the card's windows firmware if I run hdsploader. Maybe that's completely wrong...
I agree that using amixer seems to be a horrible way to work, but I could not manage to get anything out of hdspmixer... There is no way to change the routes it loads by default ! clicking on the playback labels doesn't allow to check or uncheck existing boxes.
This is why I wonder if there isn't anything wrong with my setup, namely : would the use of hdsploader change hdspmixer's behaviour ?