--- a/doc/interpreter/audio.txi
+++ b/doc/interpreter/audio.txi
@@ -28,39 +28,13 @@
 files holding data in mu-law encoding end in @file{au}, @file{mu}, or
 @file{snd}.
 
-@deftypefn {Function File} {} lin2mu (@var{x})
-If the vector @var{x} represents mono audio data in 8- or 16-bit
-linear encoding, @code{lin2mu (@var{x})} is the corresponding mu-law
-encoding.
-@end deftypefn
+@DOCSTRING(lin2mu)
 
-@deftypefn {Function File} {} mu2lin (@var{x}, @var{bps})
-If the vector @var{x} represents mono audio data in mu-law encoding,
-@code{mu2lin} converts it to linear encoding.  The optional argument
-@var{bps} specifies whether the input data uses 8 bit per sample
-(default) or 16 bit.
-@end deftypefn
-
-@deftypefn {Function File} {} loadaudio (@var{name}, @var{ext}, @var{bps})
-Loads audio data from the file @file{@var{name}.@var{ext}} into the
-vector @var{x}.  
+@DOCSTRING(mu2lin)
 
-The extension @var{ext} determines how the data in the audio file is
-interpreted;  the extensions @file{lin} (default) and @file{raw}
-correspond to linear, the extensions @file{au}, @file{mu}, or @file{snd}
-to mu-law encoding.
+@DOCSTRING(loadaudio)
 
-The argument @var{bps} can be either 8 (default) or 16, and specifies
-the number of bits per sample used in the audio file.
-@end deftypefn
-
-@deftypefn {Function File} {} saveaudio (@var{name}, @var{x}, @var{ext}, @var{bps})
-Saves a vector @var{x} of audio data to the file
-@file{@var{name}.@var{ext}}.  The optional parameters @var{ext} and
-@var{bps} determine the encoding and the number of bits per sample used
-in the audio file (see @code{loadaudio});  defaults are @file{lin} and
-8, respectively.
-@end deftypefn
+@DOCSTRING(saveaudio)
 
 The following functions for audio I/O require special A/D hardware and
 operating system support.  It is assumed that audio data in linear
@@ -70,29 +44,9 @@
 these functions will work without modification on a wide variety of
 hardware are welcome.
 
-@deftypefn {Function File} {} playaudio (@var{name}, @var{ext})
-@deftypefnx {Function File} {} playaudio (@var{x})
-Plays the audio file @file{@var{name}.@var{ext}} or the audio data
-stored in the vector @var{x}.
-@end deftypefn
-
-@deftypefn {Function File} {} record (@var{sec}, @var{sampling_rate})
-Records @var{sec} seconds of audio input into the vector @var{x}.  The
-default value for @var{sampling_rate} is 8000 samples per second, or
-8kHz.  The program waits until the user types @key{RET} and then
-immediately starts to record.
-@end deftypefn
+@DOCSTRING(playaudio)
 
-@deftypefn {Function File} {} setaudio (@var{type})
-@deftypefnx {Function File} {} setaudio (@var{type}, @var{value})
-Set or display various properties of your mixer hardware.
-
-For example, if @code{vol} corresponds to the volume property, you can
-set it to 50 (percent) by @code{setaudio ("vol", 50)}.
+@DOCSTRING(record)
 
-This is an simple experimental program to control the audio hardware
-settings.  It assumes that there is a @code{mixer} program which can be
-used as @code{mixer @var{type} @var{value}}, and simply executes
-@code{system ("mixer @var{type} @var{value}")}.  Future releases might
-get rid of this assumption by using the @code{fcntl} interface.
-@end deftypefn
+@DOCSTRING(setaudio)
+