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NAME
     gaintool - audio control panel

SYNOPSIS
     /usr/demo/SOUND/bin/gaintool [ -d device ]

DISCLAIMER
     This program is furnished on an AS IS basis as a  demonstra-
     tion of audio applications programming.

DESCRIPTION
     gaintool is an XView  demonstration  program  that  controls
     various  characteristics  of  the  system  audio  device. By
     default, gaintool operates on /dev/audio, though an alterna-
     tive  audio  device may be specified by using the -d option.
     Operations performed by the gaintool  control  panel  affect
     all audio programs using the specified device; for instance,
     adjusting the Play Volume instantly changes the output gain,
     regardless of which program is playing audio data.  Further,
     gaintool detects audio state changes made by other programs,
     and  updates  its  display  accordingly, so that it keeps in
     sync with the current device configuration.

     gaintool demonstrates an important principle involved in the
     integration of audio in the desktop environment: by enabling
     global control of important audio characteristics, it is not
     necessary  for every application to provide an interface for
     these parameters. For instance, since audio  output  may  be
     paused  from the control panel, it is not strictly necessary
     that output applications display a  Pause  button  of  their
     own.   However, such applications may detect that audio out-
     put has been paused, and take appropriate action.

  Control Panel
     Play Volume
           This slider adjusts the output volume.  Volume  levels
           between    0   and  100  may  be  selected,  where   0
           represents infinite attenuation  and  100  is  maximum
           gain.

     Record Volume
           This slider adjusts the recording gain  level  in  the
           range 0 to 100.

     Monitor Volume
           Monitor gain controls the amount of audio input signal
           that is fed through to the output port.  For instance,
           if an audio source (such as a radio or  CD-player)  is
           connected directly to the input port, the input signal
           may be monitored through either the  built-in  speaker
           or  the  headphone jack by adjusting this slider. Note
           that there may be  audible  feedback  (a  high-pitched
           whine)  if  a microphone is connected to  the worksta-
           tion and the monitor volume is set greater than zero.

     Output
           This selector switches the audio output  port  between
           the built-in speaker and the external headphone jack.

     Pause Play
           This button may be used to suspend  and  resume  audio
           output.  If  audio output is in progress when Pause is
           pressed, it is stopped immediately and subsequent out-
           put data remains queued. The button then switches to a
           Resume button that, when pressed, resumes audio output
           at the point that it was suspended.

           If no process has the  device  open  for  output  when
           Pause  is  pressed,  gaintool  holds  the  device open
           itself, thereby denying other processes output access.
           Audio programs that simply open and write to the audio
           device will typically be suspended when  they  attempt
           to  open the device. Programs that asynchronously poll
           the device will discover that it is ``busy''  and  may
           take appropriate action.

  Audio Device Status Panel
     gaintool also includes an audio status panel that shows  the
     current  state  of the audio device. This panel is extremely
     useful   for   debugging   audio   applications.   Selecting
     ``Status...'' from the panel menu brings up the status panel
     (this can also be done on a SPARC  system  by  pressing  the
     <PROPS>  (<L3>) key). Selecting ``Done'' from the panel menu
     removes the panel (this can also be done on a  SPARC  system
     by pressing the <OPEN> (<L7>) key).

     When the Update Mode is set to Status Change, the audio dev-
     ice  status  is  updated  only  when  a  SIGPOLL  signal  is
     delivered to gaintool (see audio(7I), on an  IA  system  see
     sbpro(7D)).   Because of this, the Active and  Samples indi-
     cators are not necessarily kept  up-to-date.  This  mode  is
     useful  for  application  debugging  in order to see exactly
     when audio device status changes are  being  reported.  When
     the  Continuous  mode is selected, the status is continually
     updated.

SEE ALSO
     soundtool(6), audio(7I), audiocs(7D)

     See audiotool manual page in OpenWindows  Desktop  Reference
     Manual

  SPARC Only

     audioamd(7D), dbri(7D)

  IA Only
     sbpro(7D)

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