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@ -8,7 +8,9 @@ alsactl \- advanced controls for ALSA soundcard driver
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.SH DESCRIPTION
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.SH DESCRIPTION
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\fBalsactl\fP is used to control advanced settings for the ALSA
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\fBalsactl\fP is used to control advanced settings for the ALSA
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soundcard drivers. It supports multiple soundcards.
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soundcard drivers. It supports multiple soundcards. If your card has
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features that you can't seem to control from a mixer application,
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you have come to the right place.
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.SH INVOKING
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.SH INVOKING
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@ -53,15 +55,15 @@ usually don't know about.
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The configuration file is generated automatically by running
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The configuration file is generated automatically by running
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\fBalsactl store\fP. Editing the configuration file by hand may be
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\fBalsactl store\fP. Editing the configuration file by hand may be
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necessary for some soundcard features (e.g. enabling/disabling
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necessary for some soundcard features (e.g. enabling/disabling
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automatic mic gain, digital outputs, joystick/game ports, some MIDI
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automatic mic gain, digital output, joystick/game ports, some future MIDI
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routing options, etc.).
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routing options, etc).
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.SS Configuration File Syntax
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.SS Configuration File Syntax
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There are some terms in the config file that bear explaining. The
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There are some terms in the config file that bear explaining. The
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"capabilities" comments before each line will tell you which flags you
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"capabilities" comments before each line tells you some
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can set for each channel. The comments start with semicolons. To set a
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characteristics of each channel. This is purely informational; these
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flag, simply add it to the channel() line you want.
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are not flags you can set. Capabilities are listed below.
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.TP
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.TP
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\fIhardware-mute\fP
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\fIhardware-mute\fP
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@ -81,7 +83,7 @@ The channel is stereo.
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.TP
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.TP
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\fIrecord\fP
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\fIrecord\fP
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Use the channel as a recording source.
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The channel may be used as a recording source.
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.TP
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.TP
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\fIjoin-record\fP
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\fIjoin-record\fP
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@ -90,23 +92,23 @@ and right at once; they cannot be toggled independently.
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.TP
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.TP
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\fIrecord-by-mute\fP
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\fIrecord-by-mute\fP
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Allow recording the channel even if it's muted, so you can avoid
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This channel can be recorded even if it's muted, so you can avoid
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feeding your record source to the speakers. Not all hardware supports this.
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feeding your record source back to the speakers.
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.TP
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.TP
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\fIexternal-input\fP
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\fIexternal-input\fP
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This flag is purely informational: it tells you that the channel
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The channel
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controls a signal from an external input (like Line-In or CD). This
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controls a signal from an external input (like Line-In or CD). This
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serves to distinguish external source channels from onboard
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serves to distinguish external source channels from onboard
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source channels (like OPL-3 synth), which don't have this flag set.
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source channels (like OPL-3 synth).
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.TP
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.TP
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\fIdigital\fP
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\fIdigital\fP
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If you have a card with digital outputs and/or inputs, this flag
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This channel is fed to an onboard digital mixer for possible hardware
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toggles digital output/input for the channel.
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processing (for instance, surround-sound processing if your card has it).
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.PP
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.PP
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Another feature of the configuration file is the \fIboolean\fP switches
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The configuration file also has \fIboolean switches\fP
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which are used to toggle certain card-specific advanced features. For
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which are used to toggle certain card-specific advanced features. For
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example:
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example:
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@ -114,8 +116,8 @@ example:
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switch( "MIC Gain", false )
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switch( "MIC Gain", false )
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This shows that my card has a switchable mic gain, and that it's
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This shows that my card has a switchable mic gain, and that it's
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currently turned off. To turn it on, just change "false" to "true" and
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currently turned off. To turn it on, just change "false" to "true,"
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run \fBalsactl restore\fP.
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save the config file, and run \fBalsactl restore\fP.
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.SH EXAMPLES
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.SH EXAMPLES
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@ -124,11 +126,12 @@ Let's say I have this entry in /etc/asound.conf for my PCM output.
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; Capabilities: stereo hardware-mute digital.
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; Capabilities: stereo hardware-mute digital.
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; Accepted channel range is from 0 to 63.
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; Accepted channel range is from 0 to 63.
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channel( "PCM", stereo( 40 mute, 50 mute ) )
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channel( "PCM", stereo( 40 mute, 50 mute ))
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When \fBalsactl restore\fP is run, volume will be set to 40 for the left
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and 50 for the right, but both will be muted (by hardware).
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When \fBalsactl restore\fP is run, the PCM volume will be set
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to 40 for the left and 50 for the right, but both will be
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muted. Since this card supports \fIhardware-mute\fP, muting will be done by
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hardware rather than by zeroing the levels.
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.SH SEE ALSO
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.SH SEE ALSO
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\fB
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\fB
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@ -143,3 +146,6 @@ None known.
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.SH AUTHOR
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.SH AUTHOR
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\fBalsactl\fP is by Jaroslav Kysela <perex@jcu.cz>
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\fBalsactl\fP is by Jaroslav Kysela <perex@jcu.cz>
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This document is by Paul Winkler <zarmzarm@erols.com>.
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This document is by Paul Winkler <zarmzarm@erols.com>.
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