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ALSA (Advanced Linux Sound Architecture ) is an API of audio functions for the linux platform.

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These values describe the device. If you change them, you do not change how the device actually behaves.
answered Jul 29 '16 by CL.
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To enable dsnoop by default, your particular device needs a file with the proper settings in /usr/share/alsa/cards/. To check whether dsnoop works at all, try arecord -D dsnoop -f dat test.wav. The …
answered Jul 1 '13 by CL.
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plughw goes directly to the hardware. You should use default unless you know what you're doing.
answered Jan 19 '15 by CL.
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There is a global configuration file, typically /usr/share/alsa/alsa.conf, with default settings. In most cases, the default settings will work. …
answered Oct 24 '18 by CL.
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The .wav file uses a sample format that is not supported by your hardware. Use the device name plug:surround40:CA0106 to enable automatic sample format conversion. To make this the default device, u …
answered Oct 3 '13 by CL.
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Your ALC268 chip cannot route its inputs to the speakers in hardware. You need some software like Jack or PulseAudio to do this for you.
answered Dec 25 '13 by CL.
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The beep tool controls the PC speaker, i.e., the tiny speaker on the motherboard itself. Other sound devices cannot be controlled by beep. You have to play some actual sound file, or synthesize the s …
answered Jan 24 '14 by CL.
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This is a bug in the virtual plugin. It appears that the code for handling a buffer smaller than a MIDI message was never tested. This will be fixed in alsa-lib 1.1.4; until that package reaches your distribution, you can apply the patch by hand, or work around this by using a larger buffer. …
answered Mar 18 '17 by CL.
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According to the documentation, something like this should work: pcm.dmix_front { type dmix ipc_key 12345 ipc_key_add_uid 0 slave.pcm "hw:0,0" } pcm.dmix_rear { type dmix ipc_ …
answered Apr 14 '14 by CL.
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With more complex devices, "PCM" affects the audio data played by software, while "Master" also affects everything else going to the speakers. With devices that do not have an analog mixer, this dist …
answered Nov 17 '15 by CL.
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The softvol controls are stored in memory together with other data related to the actual sound card, and are saved to and restored from /var/lib/alsa/asound.state when the machine is shutting down or … booting. So to remove them, you have to unload the sound driver module (rmmod snd-hda-intel, or whatever you're using), and then remove the entry from /var/lib/alsa/asound.state (or the entire file). …
answered Mar 30 '16 by CL.
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Kernel 2.6.32 is from 2009; you cannot expect that old drivers to work with newer hardware. Try to get a newer CrunchBang kernel, or switch to another distribution.
answered Sep 14 '12 by CL.
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'Virtual' mixer controls are attached to the driver of a 'real' sound card, and are automatically saved to and restored from /var/lib/alsa/asound.state together with the other controls. To remove … them, you must unload the driver module of your sound card (probably snd-hda-intel), and then remove the entries from /var/lib/alsa/asound.state before reloading the driver. …
answered Apr 5 '15 by CL.
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Just define a device named hw, but use ! to ensure that the built-in definition is overridden, and use @args to allow parameters (which are ignored if you don't use them in the definition): pcm.!hw { …
answered Jan 20 '13 by CL.
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The four jacks are separated physically, but the software just sees a single eight-channel device. You can split this device using ALSA plugins: pcm_slave.eightchannels { pcm "hw:x20,0 …
answered Mar 16 '16 by CL.

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