man1/aecho.1

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    aecho(1)							     aecho(1)

    NAME
      aecho	- An AF	play/record client.

    SYNOPSIS
      aecho	[-d device]

    DESCRIPTION
      aecho	reads samples from stdin and sends the sound data to the audio server
      for playback.	It simultaneously records, with	the record data	sent to
      stdout.  The play and	record operations are synchronized (i.e. the audio
      time of the first playback sample is the audio time of the first record
      sample).

      aecho	is useful for experimenting with room acoustics, and debugging audio
      hardware.

    OPTIONS

      -d device

           Specifies which audio device to use for playback	and recording.	If
           device is not specified,	aecho defaults to the first device that	isn't
           connected to the	telephone.

    ENVIRONMENT

      AUDIOFILE	 specifies the host and	server to use.

    BUGS
      There	is no way to play back a file in preempt mode.

      If you encounter a reproducible bug, please submit a problem report to
      (af-bugs@crl.dec.com).

    SEE ALSO
      AF(1), aplay(1), arecord(1)

    COPYRIGHT
      Copyright 1992-1994, Digital Equipment Corporation.
      See AF(1) for	a full statement of rights and permissions.

    AUTHORS
      Andrew Payne,	Digital	Cambridge Research Lab,	(payne@crl.dec.com)