diff --git a/Doc/lib.tex b/Doc/lib.tex
index 38ba18d..74c561c 100644
--- a/Doc/lib.tex
+++ b/Doc/lib.tex
@@ -212,7 +212,7 @@
 
 \input{libsgi}			% SGI IRIX ONLY
 \input{libal}
-%\input{libaudio}
+\input{libaudio}
 \input{libcd}
 \input{libfl}
 \input{libfm}
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index 38ba18d..74c561c 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -212,7 +212,7 @@
 
 \input{libsgi}			% SGI IRIX ONLY
 \input{libal}
-%\input{libaudio}
+\input{libaudio}
 \input{libcd}
 \input{libfl}
 \input{libfm}
diff --git a/Doc/libaudio.tex b/Doc/libaudio.tex
deleted file mode 100644
index f84252e..0000000
--- a/Doc/libaudio.tex
+++ /dev/null
@@ -1,121 +0,0 @@
-\section{Built-in Module \sectcode{audio}}
-\label{module-audio}
-\bimodindex{audio}
-
-\strong{Note:} This module is obsolete, since the hardware to which it
-interfaces is obsolete.  For audio on the Indigo or 4D/35, see
-built-in module \code{al} above.
-
-This module provides rudimentary access to the audio I/O device
-\file{/dev/audio} on the Silicon Graphics Personal IRIS 4D/25;
-see {\it audio}(7). It supports the following operations:
-
-\renewcommand{\indexsubitem}{(in module audio)}
-\begin{funcdesc}{setoutgain}{n}
-Sets the output gain.
-\iftexi
-\code{0 <= \var{n} < 256}.
-\else
-$0 \leq \var{n} < 256$.
-%%JHXXX Sets the output gain (0-255).
-\fi
-\end{funcdesc}
-
-\begin{funcdesc}{getoutgain}{}
-Returns the output gain.
-\end{funcdesc}
-
-\begin{funcdesc}{setrate}{n}
-Sets the sampling rate: \code{1} = 32K/sec, \code{2} = 16K/sec,
-\code{3} = 8K/sec.
-\end{funcdesc}
-
-\begin{funcdesc}{setduration}{n}
-Sets the `sound duration' in units of 1/100 seconds.
-\end{funcdesc}
-
-\begin{funcdesc}{read}{n}
-Reads a chunk of
-\var{n}
-sampled bytes from the audio input (line in or microphone).
-The chunk is returned as a string of length n.
-Each byte encodes one sample as a signed 8-bit quantity using linear
-encoding.
-This string can be converted to numbers using \code{chr2num()} described
-below.
-\end{funcdesc}
-
-\begin{funcdesc}{write}{buf}
-Writes a chunk of samples to the audio output (speaker).
-\end{funcdesc}
-
-These operations support asynchronous audio I/O:
-
-\renewcommand{\indexsubitem}{(in module audio)}
-\begin{funcdesc}{start_recording}{n}
-Starts a second thread (a process with shared memory) that begins reading
-\var{n}
-bytes from the audio device.
-The main thread immediately continues.
-\end{funcdesc}
-
-\begin{funcdesc}{wait_recording}{}
-Waits for the second thread to finish and returns the data read.
-\end{funcdesc}
-
-\begin{funcdesc}{stop_recording}{}
-Makes the second thread stop reading as soon as possible.
-Returns the data read so far.
-\end{funcdesc}
-
-\begin{funcdesc}{poll_recording}{}
-Returns true if the second thread has finished reading (so
-\code{wait_recording()} would return the data without delay).
-\end{funcdesc}
-
-\begin{funcdesc}{start_playing}{}
-\funcline{wait_playing}{}
-\funcline{stop_playing}{}
-\funcline{poll_playing}{}
-\begin{sloppypar}
-Similar but for output.
-\code{stop_playing()}
-returns a lower bound for the number of bytes actually played (not very
-accurate).
-\end{sloppypar}
-\end{funcdesc}
-
-The following operations do not affect the audio device but are
-implemented in C for efficiency:
-
-\renewcommand{\indexsubitem}{(in module audio)}
-\begin{funcdesc}{amplify}{buf\, f1\, f2}
-Amplifies a chunk of samples by a variable factor changing from
-\code{\var{f1}/256} to \code{\var{f2}/256.}
-Negative factors are allowed.
-Resulting values that are to large to fit in a byte are clipped.         
-\end{funcdesc}
-
-\begin{funcdesc}{reverse}{buf}
-Returns a chunk of samples backwards.
-\end{funcdesc}
-
-\begin{funcdesc}{add}{buf1\, buf2}
-Bytewise adds two chunks of samples.
-Bytes that exceed the range are clipped.
-If one buffer is shorter, it is assumed to be padded with zeros.
-\end{funcdesc}
-
-\begin{funcdesc}{chr2num}{buf}
-Converts a string of sampled bytes as returned by \code{read()} into
-a list containing the numeric values of the samples.
-\end{funcdesc}
-
-\begin{funcdesc}{num2chr}{list}
-\begin{sloppypar}
-Converts a list as returned by
-\code{chr2num()}
-back to a buffer acceptable by
-\code{write()}.
-\end{sloppypar}
-\end{funcdesc}