How to control ordering of staves?

[aliteralmind]

Here's an image of what I keep getting:

http://jeffyepstein.com/tmp/staves_bad.gif

I'm trying to get the "clap" staff above the "voice" staff. Can someone
please help me understand how to control the ordering of staves? (I only
want the clap staff to appear for the first measure.)

This is what I'm trying to get:

http://jeffyepstein.com/tmp/staves_good.gif


Below is my LY code. Thank you for helping.

-----------------------------------------

\version "2.12.2"

clap = \new Staff \with {
  \override StaffSymbol #'line-count = #1
  } \relative c'' {
   \time 24/8
   \set Staff.instrumentName = #"Clap"
        \teeny
        \override NoteHead #'style = #'cross
        r4. b8 r4 r4. b8 r4 r4. b8^"Repeat throughout" r4 r4. b8 r4 |  }

bla = \relative c'' {
   \set Staff.instrumentName = #"Voice"
   \time 24/8
   \tempo 4.=80
   \override NoteHead #'style = #'cross
   \repeat volta 2 {  b4. r b4. r b4. r4 b8^\markup {
           \italic \left-column \small  {
                  \line{  Quiet first time  }
        \line{  Loud second time  } } }~ b4. r4. |  }
   \repeat volta 2 {  b4 b8 b4 b8 b4. b b b4 b8~ b4. r4. |  }
}


verseOne = \lyricmode {
  Bla bloo bla bloo bla dee bla dee bla dee bla dee bla.
}

\score {
        \new Staff <<
      \new Voice { \clap }
      \new Voice = "bla" { \bla }
      \new Lyrics \lyricsto "bla" { \verseOne }
   >>
   \layout { }
   \midi { }
}

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