Is there a way to redefine \chapter? I am using the package \setspace
to doublesapce my document, but I want chapter and section titles to
be single spaced. I tried using these two lines:

\let\OldChapter=\chapter
\renewcommand*{\chapter}[1]{\singlespacing\OldChapter{#1}\doublespacing}

The problem here is that if I use 

\chapter*{Title}

The latex uses the "*" as the one and only argument. 

For pure latex, I could use:

\newcommand*{\Chapter}[1]{\singlespacing\chapter{#1}\doublespacing} 

But then I would have to use ugly ert in LyX. 

I have tried almost every possible way to get change the definition of
\chapter, including altering the primitive \makechaphead command and
asking on the texhax mailing list, but have had no luck. 

By the way, I am using the memoir class, which allows you you alter
almost
everything in \chapter, but does not allow you to changed spacing.

Paul

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