2 sound outputs at once

Hi all. I have a 2008 mac pro running snow leopard, and want to preview some sound edits with a co worker. I have a usb headphones in the usb socket, and another set of headphones in the line out.....how can I get both of these to play at the same thing at the same time rather than just one or the other?

Have you tried the Audio Midi Setup utility? If it is possible that is where you will set things up.

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    Thanks

    Have you tried the Audio Midi Setup utility? If it is possible that is where you will set things up.

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    Hey guys, I have this sound output issue with my Macbook pro 2010 September version that every once in a while, the audio output would keep swapping between headphone, digital output and the speakers when NO headphone or digital output or what so ever is actually plugged in. During this time i am unable to adjust sounds, and my menu bar would become very slow to respond (the sound icon and Soundsource application would stop responding during this time). After a while (could be less than 10 minutes or last to about an hour, it varies), it returns back to normal by itself.
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    I have both and haven't experienced this at all. Very strange. I do get a lot of random channel changes however when I put my iPad on the remote, the cat walks over it or the dog sits on it.
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  • Alsa: reroute sound output to line in?

    Hello,
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    a familiar problem: i want to use alsa's sound output - pcm or master - internally.
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    - copied over from here.
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    [ 19.315080] snd_hda_intel 0000:00:1b.0: irq 44 for MSI/MSI-X
    [ 20.408741] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
    [ 20.408940] input: HDA Intel Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
    [ 20.409100] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
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    Last edited by ondoho (2013-11-07 19:37:46)

    so, is it possible to duplicate & reroute the default card's pcm or master channel back into the default card's Line channel (Line in)?
    If you're talking about the analog audio path the answer is maybe. But fair warning, you'll be spending many more hours (maybe) getting it to work while wallowing real deep in today's integrated audio hardware and ALSA if you want to use this method.
    the soundcard is a basic laptop intel chip.
    This is the first thing you need to learn. That chip is generic and found on almost all modern x86 motherboards. Where the audio magic actually happens is the "codec" chip and the vendor/model varies. The HDA Intel chip merely "talks" to the codec chip which sits "behind" the HDA Intel chip on the bus.
    So the first step is to figure out which codec chip is installed and then determine if you can "manually" connect the "virtual wires" inside the codec to make a connection from the output (play) to the input (capture).
    One way that you might find which codec you have is to enter:
        less /proc/asound/cardX/codec#Y
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    Just look for "Codec:" near the top. Also, there's gobs of other good info in that file that will be used in a moment.
    The codec chip contains what I call "virtual wires" that connect it's internal components (amplifiers, mixers, ADCs, DACs, etc). ALSA gathers info from BIOS and determines which connections to enable, but I've found that most codec chips have many connections that are not enabled. More importantly in this case, I've also found that many chips have a connection from the output (play) to the input (capture), it's just not enabled... and that may (or may not) also be the case for your chip. I've been able to enable the internal connections in my chips to create a hardware loopback so that Line Out is connected to Line In... so what you hear in the speakers is also sent to ALSA's capture interface... and the capture level is independently adjustable.
    So how would you inspect and change these "virtual wires"? With a program called hda-analyzer. It will use the data in the /proc/asound directory (and more) to show you how your codec is wired in both text and graphics form, along with allowing you to change it. One way to get it is by running this command:
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    Once you get it running, the confusion factor will probably kick into high gear. Take your time and poke around. Get your bearings somewhat by clicking on "Graph" to display the wiring layout and hover your mouse over the square blocks and the wires. As I said in a previous post, if you can download the datasheet for your codec chip, it may help if it includes an internal diagram:
    https://bbs.archlinux.org/viewtopic.php?id=147208
    https://bbs.archlinux.org/viewtopic.php … 3#p1089243
    Any changes you make to the "wiring" are instantaneous (so you can try it while making changes) and will go away on a reboot. Clicking "Exp" will create a python script of your changes that you can run later to make those connections again from the command line.
    Good luck, and I'll check back to help if I can find the time... that is if you're up for such a major challenge.
    Last edited by pigiron (2013-11-10 04:31:25)

  • No Sound Output from front headphones jack on HPE-070a

    Two days ago, i purchased a new HPE-070a with Windows 7 64-bit and Realtek HD Audio Drivers. Unfortunately, while the sound output to the speakers from the rear jack is working really well, the headphone jack at the front of the box has no output. I've updated the Realtek drivers and reinstalled them as well,but when I run the troubleshooter, it tells me that "sound playing not functioning". The PC recognises that, once the headphones are in that's where the sound is output, but there's nothing going on.
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    Beaker, have you checked in the Control Panel to assure that all boxes are checked correctly?  It may be that the headphone jack is not enabled.
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