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snd_ctl_replace(9) [centos man page]

SND_CTL_REPLACE(9)						 Control/Mixer API						SND_CTL_REPLACE(9)

snd_ctl_replace - replace the control instance of the card SYNOPSIS
int snd_ctl_replace(struct snd_card * card, struct snd_kcontrol * kcontrol, bool add_on_replace); ARGUMENTS
card the card instance kcontrol the control instance to replace add_on_replace add the control if not already added DESCRIPTION
Replaces the given control. If the given control does not exist and the add_on_replace flag is set, the control is added. If the control exists, it is destroyed first. It frees automatically the control which cannot be added or replaced. RETURN
Zero if successful, or a negative error code on failure. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SND_CTL_REPLACE(9)

Check Out this Related Man Page

FM(1)							      General Commands Manual							     FM(1)

fm - control frequency, volume, mute/unmute of FM radio card SYNOPSIS
fm [ -h ] [ -o ] [ -q ] [ -d device ] [ -t tuner ] [ -T none | forever | time ] on | off | + | - | freq [ volume ] DESCRIPTION
fm is a program to control the frequency, volume, and mute/unmute state of an FM radio card, using the video4linux interface introduced in 2.1.x series Linux kernels. OPTIONS -h Print a usage message to standard output, and exit. -o Ignore frequency range limits of card. Use if you suspect that the card supports a wider frequency range than its driver believes. -q Quiet mode. Keeps information on station and volume from being printed on standard output. -d device Sets device as the device to tune. The default is /dev/radio0. -t tuner Sets tuner as the tuner on the selected device to adjust. The default is tuner 0. Most radio devices have only a single tuner. -T none | forever | time After tuning, sleep for the time specified or forever. Time is specified in seconds by default. A suffix of m indicates minutes, h indicates hours, or d indicates days. The -T option is useful with radio card drivers that only maintain the tuner settings while the tuner's file descriptor remains open. Try using this option if running fm ordinarily produces only a single "pop" from your speakers. freq Frequency to tune the radio to, in MHz. For instance, 88.9 specifies a frequency of 88.9 MHz. AM tuner values are also specified in MHz; for instance, 530 kHz would be specified as .530. on Turn the radio on (unmute). off Turn the radio off (mute). volume Specify the desired volume, in percent. Not all radio devices support volume control. + Increase the current volume. - Decrease the current volume. CONFIGURATION
fm reads $HOME/.fmrc, if it exists, to obtain default settings. Each line may take one of the following forms: VOL percent Specifies default volume (default: 12.5%). INCR percent Volume increment used for + and - options (default: 10%). TIME Default sleep time (default: none). All other lines are ignored. SEE ALSO
Additional documentation: /usr/share/doc/fmtools/README The fmtools homepage: AUTHORS
Russell Kroll <>, now maintained by Ben Pfaff <>. Sleep time feature contributed by Dave Ulrick <d->. This manpage written by Ben Pfaff. fm 1.0.2 FM(1)
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