more than 2 voices using partcombine

[Eby Mani]

Is it possible to combine morethan 2 voices using \partcombine ?. Did anyone 
re-write this ?

I have need to combine 3 voices to a single staff, I've tried

******************
\new PianoStaff <<
        \context Staff = upper <<
                \context Voice = OrganRHi { \voiceOne \global \OrganRHOne }
                \context Voice = OrganRHii { \voiceTwo \global \OrganRHTwo }
                                >>

        \context Staff = lower <<
                \context Voice = OrganLHi { \partcombine \OrganLHOne 
\OrganLHTwo }
                \context Voice = Pedals { \voiceFour \global \OrganLHThree }
                                >>
                >>
******************

This wouldn't print the Pedals at all, any suggestions ?. Thanks.

Eby