Hi Ming, when you have the \change Staff already (as adviced in another mail on the list), what you need here is \showStaffSwitch:
For example:
\version "2.18.2"
<<
\new Staff = up {
\showStaffSwitch
a1 \change Staff = "down" c''1
}
\new Staff = down {
\voiceTwo
c'1 c'1
}
>>
HTH
Joram
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