Re: [gentoo-user] Usb sound and ALSA

[Leandro Melo de Sales]

Hi... The device is configured and I type cat xxx > /dev/sound/dsp1
and I got an strange sound, but this prove that the device was
recognized by the kernel. I also can control volume of the second
audio device through alsamixer. The question is: how can I specify (on
alsa) that the default device is /dev/sound/dsp1 or something like
that?
   I tried to do what you said on Amarok, but the "Alsa Device
Configuration" section is disabled, why?

[]s
Leandro.

2006/10/31, Richard Fish <bigfish@××××××××××.org>:
> On 10/30/06, Leandro Melo de Sales <leandroal@×××××.com> wrote:
> > Hi list...
> >
> >    I have an usb sound system from Gradiente company (an eletronic
> > device factory) and I plugged it on my system. dmesg command shows
> > this:
> >
> >     input: Gradiente AS-M5X0 as /class/input/input3
> >     input: USB HID v1.00 Device [Gradiente AS-M5X0] on usb-0000:00:1d.1-1
> >
> >    But when I play a mp3 media the sound is not forwarded to my usb
> > device, instand, the sound is still played through my integrated
> > laptop device.
> >    On windows I use it without problem. So, what do I have to do to
> > forward the sound to my usb device?
>
> Probably windows is disabling any existing sound card or at least
> making the USB the "default" sound device.  Unfortunately there is no
> equivalent with alsa currently.
>
> So assuming that you've got the alsa drivers loaded for this device
> (/proc/asound/cards should contain two entries), you can usually
> specify alsa device as "hw1,0".  The exact method for doing this
> depends on what app you are using.  For example on amarok with the
> xine it is under Configure Amarok... -> Engine -> ALSA Device
> Configuration.  If you enter hw1,0 for Stereo there, then 2 channel
> audio should be played on the first pcm of the second sound card.
>
> You should also be able to do this with a .asoundrc file, with an entry like:
>
> pcm.default {
>         type hw
>         card 1
>         device 1
> }
>
> The above is really primitive, without any dmix plugin (software
> mixing), so only one app could use the device at a time unless it does
> hardware mixing.  Mostly this is just to give you an idea of where to
> look! ;-)
>
> -Richard
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