shortcut for \voiceX revert?

[Kieren Richard MacMillan]

[ Mac OS X 10.2.8;  Lilypond 2.0.1 ]

Hello, all --

Just wondering if there's a short form for reverting a \voiceOne (etc.) 
directive.

Alternately, if I could be pointed to the actual definition of the 
directive, I could reverse it in my own \voiceOff directive. [I guess 
it would include { \stemBoth \tieBoth \slurBoth \shiftOff }, but what 
else?]

Thanks!
Kieren.