snd_ctl_replace(9) [centos man page]

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

NAME

       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)

FM(1)							      General Commands Manual							     FM(1)

NAME

       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:
	      http://benpfaff.org/fmtools

AUTHORS

       Russell	Kroll <rkroll@exploits.org>, now maintained by Ben Pfaff <blp@cs.stanford.edu>.  Sleep time feature contributed by Dave Ulrick <d-
       ulrick@insightbb.com>.  This manpage written by Ben Pfaff.

								     fm 1.0.2								     FM(1)