From: James Courtier-D. <Ja...@su...> - 2003-10-04 14:37:47
|
Sorry, posted to wrong list. James Courtier-Dutton wrote: > Hi, > > With 5.1 channel sound being used quite a lot now, I was wondering what > to do about volume controls. > For example, I have: - > Front speakers controlled by PCM and Master slider. > Rear speakers controlled by Surround slider > Center controlled by Center Slider > LFE controlled by LFE slider. > > I would assume that a "Master" slider would control all 6 channels at > the same time. > So, in this setup, the Master slider is not actually acting as a Master, > but instead, only a Front speaker control. > > I suggest that in these cases, "Master" gets renamed to something else, > and then alsa-lib takes over providing a "Master" > alsa-lib could then also use config files, to define the mixer elements. > We could then provide mixer elements that do proper "Master", > "Front/Rear Fader" etc. > > I know you said earlier that you are in the process of developing a > better mixer, possibly having 0db points etc. > Could you add these suggestions, so that they are possible as well. > > Another problem I have come across, is that some sound cards have a > headphone amplifier on the front speaker output, and some sound cards > have a headphone amplifier on the rear/surround outputs. > E.g. ALC650 has headphone on front output. > AD1985 has headphone on surround (but is switchable to front). > Does anyone know if the AC97 standard is headphones on front, or > headphones on rear/surround ? > I was talking to a user who has sound coming out of a speaker output, > but not the headphone or center/lfe outputs, also the slider name > controlling the speaker output was "surround". > It would be nice to find out from yourselves what the AC97 standard says > it should be, and I will then post a PATCH to get the AD1985 to act in > the same way as all other sound cards. > > Cheers > James > > |