Re: Error in user manual.

["T. V. Raman" <raman@xxxxxxxxxxx>]

The other "app"was probably esd.

Cards like the Soundblaster Live can mix up to 32 channels of audio on
the card, 
and consequently allow multiple processes on Linux to open /dev/dsp
--to each app it looks like it has the sound card,
and the card does the mixing.
Cards like the soundblaster 64 cannot do this --as is the case with
cards on most laptops.

Packages like ESD or arts (part of KDE) run a sound server that keeps
the device open and provide sound access to all the apps that want it
--so the mixing happens on the host --rather than on the card.>>>>> "Janina" == Janina Sajka <janina@xxxxxxxxxxx> writes:

    Janina> There's also more to this which I frankly don't fully
    Janina> understand.  For example, I have a portable machine with a
    Janina> Pentium III which plays multiple wav files just fine in
    Janina> Windows, but not in my Linux installation. At least not
    Janina> until I installed Jack:

    Janina> http://jackit.sourceforge.net/

    Janina> This is software to allow multiple, simoultaneous
    Janina> sound. There's at least one other app like Jack that I've
    Janina> come across, but I don't recall what/where.

    Janina> Thomas Ward writes:
    >> From: "Thomas Ward" <slingshooter@xxxxxxxxxxx>
    >> 
    >> Hi.
    >> 
    >> I would like to point out a glaring error in Jennifer's user
    >> manual which needs correcting.
    >> 
    >> Jennifer writes: "If you want to use auditory icons and
    >> ViaVoice is your speech synthesizer, check to see whether or
    >> not you have a multi-channel sound card (try playing a CD and a
    >> .au file at the same time - if it works, you have a
    >> multi-channel card). If your card is not multi-channel, you
    >> must install the application."
    >> 
    >> First, multichannel only works on the pcm channel which runs
    >> wave files, mp3 files, real audio, and of course viavoice. The
    >> CDA channel which the audio cd's play on have always been
    >> independant channels from the pcm channel. of course, that
    >> means that all sound cards will play audio and pcm channels at
    >> the same time. Which means the only way to correctly test for
    >> multichannel is to play more than one wave files at the same
    >> time or play wave files with viavoice going, etc.  Also note
    >> some cards are multichannel, but some Linux drivers don't
    >> support the multichannel ability of the card.
    >> 
    >> Hth.
    >> 
    >> 
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    Janina> --
	
    Janina> 				Janina Sajka, Director
    Janina> Technology Research and Development Governmental Relations
    Janina> Group American Foundation for the Blind (AFB)

    Janina> Email: janina@xxxxxxxxxxx Phone: (202) 408-8175

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-- 
Best Regards,
--raman

      
Email:  raman@xxxxxxxxxxx
WWW: http://www.cs.cornell.edu/home/raman/             
AIM: TVRaman
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