2010/6/14 James Courtier-Dutton <james.dutton@xxxxxxxxx> > On 14 June 2010 10:54, Raymond Yau <superquad.vortex2@xxxxxxxxx> wrote: > > 2010/6/14 James Courtier-Dutton <james.dutton@xxxxxxxxx> > >> If you use "alsamixer", dB values are shown so it is easy to find the > >> 0dB "sweet spot". > >> I think it is pulse audio that hides this information when it combines > >> two alsa mixer controls into one pulseaudio control. > >> > > > > > > The base volume seem to be the software 0dB point , (no software > > gain/atten), but the user want the hardware 0dB point (no hardware > > gain/atten if the hardware can provide hardware gain > > > > This hardware 0dB point is extremely important when you want to record > using > > line in and line out > > alsamixer gives the hardware 0dB point. > you are right , For ac97 Base volume is the real hardware 0dB point of PCM volume, and Volume NORM is just the max_dB of +12dB which PA labeled it as 100% aka 0dB aka Volume NORM For HDA , there is no yellow region because max_dB is 0dB , Base Volume and NORM is at the same point http://en.wikipedia.org/wiki/Line_level How can I get distortion free recording by line in of ac97 sound connected to line out of HDA onborad and vice versa ? http://pulseaudio.org/wiki/WritingVolumeControlUIs#Colouredvolumesliders _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
