Reverted the last change; the extra cruft is harmless for formatted versions,

and allows the info to work through this section.

Doc/lib/libaudioop.tex

@@ -173,14 +173,19 @@ Reverse the samples in a fragment and returns the modified fragment.
 
 \begin{funcdesc}{rms}{fragment, width}
 Return the root-mean-square of the fragment, i.e.
+%begin{latexonly}
+\iftexi
+%end{latexonly}
 the square root of the quotient of the sum of all squared sample value,
 divided by the sumber of samples.
 %begin{latexonly}
+\else
 % in eqn: sqrt { sum S sub i sup 2  over n }
 \begin{displaymath}
 \catcode`_=8
 \sqrt{\frac{\sum{{S_{i}}^{2}}}{n}}
 \end{displaymath}
+\fi
 %end{latexonly}
 This is a measure of the power in an audio signal.
 \end{funcdesc}