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NAME
     audiocontrol - audio control panel

SYNOPSIS
     audiocontrol [ -d device ] [ generic-tool-arguments ]

DESCRIPTION
     Audio Control is an  OpenWindows  DeskSet  application  that
     controls  and  configures  the workstation audio device.  By
     default, Audio Control operates on  /dev/audio,  though  the
     AUDIODEV  environment  variable can be used to override this
     default.  An alternate audio device name may be  entered  on
     the command line using the -d option.

     Operations performed by  the  Audio  Control  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, Audio Control detects  audio  state  changes
     made by other programs, and updates its display accordingly,
     so that it stays synchronized with the current device confi-
     guration.

     In addition to command line initiation, Audio Control may be
     started  via  the  ToolTalk  Media Exchange Protocol.  Audio
     Tool, for instance, invokes Audio  Control  for  volume  and
     audio port control.

     Audio Control 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  the
     audio  output  can  be set from the control panel, it is not
     strictly necessary that output applications  contain  output
     port  controls  themselves.   However, such applications may
     detect that the audio output port has been changed, and take
     appropriate action.

Play Control Panel
     Output Port
          This selector  redirects  audio  output.   There  is  a
          selector  for  each  available  output port provided by
          your hardware configuration.  Normally,  the  available
          output  ports include Speaker and Headphone.  Some sys-
          tems also support Line Out.  If a  control  is  present
          but  inactivated  (greyed-out), this indicates that the
          corresponding port is supported,  but  is  unavailable;
          this  can  happen,  for instance, when the audio device
          detects that a headset has not been  plugged  into  the
          headphone  jack.  Note that some devices allow multiple
          output ports to be enabled simultaneously.

     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.

     Play Balance
          This slider adjusts the left/right balance.  This  con-
          trol  does not appear if the audio device does not sup-
          port stereo balance control.

     Mute This button is used to enable and disable audio  output
          muting.  Note that muting output has no effect on audio
          input recording.

     Record...
          This button brings up the Record Control Panel.

Record Control Panel
     Input Port
          This control selects the audio input port.  There is  a
          selector for each available input port provided by your
          hardware configuration.   On  many  systems,  only  the
          Microphone  port  is  available,  although some systems
          also support Line In.  If  a  control  is  present  but
          inactivated   (greyed-out),  this  indicates  that  the
          corresponding port is supported,  but  is  unavailable;
          this  can  happen,  for instance, when the audio device
          detects that a microphone has not been plugged into the
          microphone  input  jack.   In  general, input ports are
          mutually exclusive; that is, audio signals on  multiple
          inputs are not mixed.

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

     Record Balance
          This slider adjusts the left/right balance.  This  con-
          trol  does not appear if the audio device does not sup-
          port stereo balance control.

     Auto-Adjust
          Clicking this  button  starts  an  automatic  recording
          level  adjustment procedure.  The input data is scanned
          to determine its loudness  and  the  record  volume  is
          adjusted  to achieve an optimal signal level.  Once the
          input signal appears  to  be  properly  calibrated  for
          several  seconds,  the  panel  will  reset  to a normal
          operating state.  All input  audio  data  is  discarded
          during the automatic adjustment procedure.

          A display gauge indicates the overall input level.   If
          you  have  connected  a  microphone  to the audio input
          jack, then you may adjust the recording level for  your
          speaking  voice  by pressing the Auto-Adjust button and
          then speaking normally into the  microphone  until  the
          adjustment  process is finished.  If you have connected
          a CD-player or other audio source, you can  adjust  the
          Monitor  Volume  to  hear  the audio data that is being
          used to calibrate the recording level.

     Monitor Volume
          This slider adjusts the monitor gain level in the range
          0  to  100.   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 the selected out-
          put port by adjusting this slider. Note that there  may
          be  audible feedback (a high-pitched whine) if a micro-
          phone is connected to the workstation and  the  monitor
          volume is set greater than zero.

Audio Device Status Panel
     Audio Control includes an audio status panel that shows  the
     current state of the audio device.  This panel can be useful
     for debugging audio  applications  and  determining  whether
     applications  are locking out the audio device by holding it
     open.  Selecting ``Status...'' from the panel menu or press-
     ing the PROPS (L3) key brings up the status panel.

     Update
          When the Update selector is set to Status  Change,  the
          audio device status is updated only when a SIGPOLL sig-
          nal is  delivered  to  Audio  Control  (see  audio(7)).
          Because  of this, the Active and Samples indicators 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 continu-
          ally updated.

SEE ALSO
     audiotool(1), audio(7)

NOTES
     The OpenWindows environment may no longer be supported in  a
     future  release.  You may want to migrate to CDE, the Common
     Desktop Environment.

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