Le Sun, 22 Jul 2012 20:11:27 +0200, Dominique Michel <dominique.mic...@vtxnet.ch> a écrit :
> Le Sun, 22 Jul 2012 15:43:47 +0100, > Justin <alsa-u...@justinh.force9.co.uk> a écrit : > > For that, forget alsa and use jack (jack-audio-connection-kit). > In order to install it, install qjackctl, jack will be installed as > a dependency. For low latency setup, and to be able to route the 16 input ports and the 16 output ports, this file from the kernel doc explain the configuration details for jack: http://www.kernel.org/doc/Documentation/sound/alsa/emu10k1-jack.txt The big advantage of jack over alsa for this card, independently of the other jack features, is than you will be able to route all the inputs and outputs on the fly with qjackctl, and without the need to reprogram the DSP of the card. For an in-deep explanation of the alsa mixer for that card: http://www.kernel.org/doc/Documentation/sound/alsa/SB-Live-mixer.txt > > If the snd-aloop module is available with your distribution, the best > setup is to use it as first sound card as explained here: > http://proaudio.tuxfamily.org/wiki/index.php?title=DAW_Digital_Audio_Workstation#Using_an_ALSA_Loopback_device_and_JACK_alsa_in.2Falsa_out_clients > > That way, the ALSA only software will use the loopback by default and > will be available in jack. With qjackctl, you can control the daemon > and interconnect any output with any input (soft or hard). > > If snd-loopback is not in your distribution, your still have 3 > possibilities to get jack and alsa to work toguether: > 1) It is another solution explained in the url above. > 2) compile and install your own kernel > 3) fill a bug to your distribution asking for the inclusion of > snd-aloop > > Dominique > > > Hi there, > > > > I'd like to ask some questions regarding various things centred > > around a Sound Blaster Live! Value (CT4780) card. My set up is as > > follows: > > > > - I have a PC running Debian with a 2.6.32-5-686 kernel > > - /proc/asound/version is "Advanced Linux Sound Architecture Driver > > Version 1.0.21." > > - I have two amplifiers connected, each with two speakers, one > > amplifier is connected to the green 'front' output, the other to the > > black 'surround' output. > > > > Note: > > > > - I have no interest in proper surround sound playback. > > - I apologise in advance for using the incorrect terminology. > > - I have a background in sound desks / mixers, and would like to use > > my card (if possible) to replicate the functionality of auxilliary > > sends. > > - I know almost nothing about ALSA and have struggled to find good > > documentation aimed at a non-developer user. > > - I don't mind writing a C program or two if need be to make my > > sound card do certain things. > > > > The story: > > > > I installed the card in the PC and it seems to be doing basic > > functions fine. I can open alsamixer and adjust various volumes > > correctly (once I'd figured out which were which) and I can play > > mp3s with mplayer for example. > > > > I am not sure what the correct term is, so from here on, I will > > refer to the source of sounds that come from applications like > > mplayer as the 'software source'. > > > > I can hear music from both the front and surround speakers when I > > play mp3s with mplayer, and it seems that the 'Playback' part of > > Alsamixer gives me the following useful controls: > > > > Master - allows me to adjust the overall output volume of the > > card. PCM - seems to be a sort of submaster volume control > > for both 'software source' and 'capture sounds'. Wave - > > seems to control how much of the 'software source' is sent to the > > front speakers. Wave Surround - seems to control how much of the > > 'software source' is sent to the surround speakers. > > > > This is great and I have no complaint. Now, I plugged in my TV PC > > into the sound card's Line-In socket. I can hear this in either of > > the following two ways: > > > > 1) unmute the Line channel on the Playback mixer, turn the volume up > > 2) set the Line channel's capture flag on the Recording mixer, set > > the 'Capture' channel's capture flag on the Recording mixer, adjust > > its volume. > > > > In either scenario, the sound from the TV PC only is sent to the > > front speakers. In scenario 2) I can also adjust the volume of the > > Line signal using the PCM channel on the Playback mixer. > > > > The end goal: > > > > I'd like if I could the other stereo inputs on the sound card > > (internal MPC2? connections) to allow me to connect two additional > > sources of sound and use the soundcard hardware to do the > > appropriate routing so I can choose which sources of sound are > > routed to which pair of speakers. > > > > In a sound desk mixer, this is easily achieved with 1 aux send. > > > > The question: > > > > Is it possible to control the routing of the input channels to the > > various outputs on the card? I'd like to avoid using real time > > software like sox to continuously copy sound from one place to > > another. Does this card even support what I'm asking or is it > > simply not possible? > > > > Kind regards, > > > > Justin > > > > > > > > ------------------------------------------------------------------------------ > > Live Security Virtual Conference > > Exclusive live event will cover all the ways today's security and > > threat landscape has changed and how IT managers can respond. > > Discussions will include endpoint security, mobile security and the > > latest in malware threats. > > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > > _______________________________________________ Alsa-user mailing > > list Alsa-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/alsa-user > > -- "We have the heroes we deserve." ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. 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