In the upper staff I have the following phrase which I would like the last note, a Gb in the second octave of the instrument be engraved on the bass clef of the second staff. Currently it is just placed below the treble with ledger lines:
\layout {
\context {
\PianoStaff
\consists #Span_stem_engraver
}
}
{
\new PianoStaff <<
\new Staff {
\clef bass
\set Staff.pedalSustainStyle = #'mixed
\repeat tremolo 8 { d,16\sustainOn\< <bes, c>16\fermata\!\>}
\repeat tremolo 8 {d,\!\< <aes, c>\!\>\fermata}
\clef treble
r1\sustainOff\! r1 r1
r4 r4 r4 r16 \ottava #1 bes'''8. \ottava #0
r8 f''8\sustainOn \grace{ b!32( bes' c''} \ottava #1 a'''!8\fermata) \ottava #0 r8\sustainOff r4 r8 \clef bass d,!\pp\fermata
\clef treble
\tuplet 3/2{ r8 ges'4} bes'4 \tuplet 3/2{ aes'4 ees'8~} ees'8 bes8~ bes~ <bes c'>\fermata
cis''4\f\> \tuplet 3/2{ r8 gis'4} \tuplet 3/2{ c'!4\!\p r8}
r8 gis'8\mf\staccato r4 r4 r16 f'8.\mp
\tuplet 3/2{ r8 ees'16 aes'16 f'8} \tuplet 3/2{ bes4 des'8}
\tuplet 3/2{ r8 aes'4} e8\staccato ges'8
\grace{e32} ges'8\fermata bes8 \tuplet 3/2{ e'4 gis'8~} \tuplet 3/2{ gis'8 b'4} \tuplet 3/2{ gis'4 b8~} \tuplet 3/2{ b8 r4 } \tuplet 3/2{ r4 b'8\staccato\sf} b16\p b b b
\tuplet 3/2{ b8 b8 r16 b16~} b8 b32 b32 b32 b32~ b32 b32 b32 b32 b32 b32 b32 b32~ b8 b8->\ff
r16 \tuplet 3/2{ b32 b-> r32} r16 b16->~ \tuplet 3/2{ b4 b8~}
r8 \tuplet 3/2{ b16-> b8} b8 b32\staccato b32\staccato r16 b16 r8.
\bar "||"
r8^\markup{\huge "rascher"} b8 r8 a'8\mp r4 \tuplet 3/2{ a'8\staccato cis'\staccato e'\staccato} r32 a'16. r32 g'16.
r8 d''16 f'' \tuplet 3/2{ g'8 fis' r32 cis'16.->} \tuplet 3/2{ r4 cis'8\p-\markup{\italic "doux"}\fermata} r4 a'16~ <g' a'>~ <g' a' cis''>~ <g' a' cis'' b'> r32 d''16. bes'8 cis' e'
\time 7/8
\tuplet 3/2 { r16 dis'8\mp\>} c''8 dis' b\!\ppp r8
gis'8~ gis'16 fis'16
\time 4/4
\tuplet 3/2{ b'8 gis'4} \tuplet 3/2{ r8 b4->\f}
fis'8 r16. d''32~ d''8 r8 g'8 r8 b r8 a'-> \tuplet 3/2{r8 dis''16~} \tuplet 3/2{dis''16 b'8} r32 gis'16.~
\time 3/8 \tuplet 3/2{gis'16 fis' e'}
\tuplet 3/2{cis'8\sp d'~ dis'}
\time 4/4
r8 cis''8\ppp fis'' dis'' r8 gis' gis' g'! g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 g'16 r32 g'32~ g'16\fermata
d''8->\f r8 \tuplet 3/2{ c'8 fis'4} \tuplet 3/2{ c''8 e'' c''} \tuplet 5/4{ e'16 g' c'' e'' bes''~}
\tuplet 3/2{ bes''4 fis''8~} fis''8 r8 \tuplet 3/2{ r8 d'4}
\tuplet 5/4{ bes16 d' fis' c'' e''} \tuplet 3/2{ bes''8 fis'' bes'~} \tuplet 3/2{ bes'8 ges'4} a'8 r8 \grace{ d''16} bes'16.\portato r32 r8
\time 5/8
d'8 \tuplet 5/4 { bes16 d' fis' bes' fis''} \tuplet 3/2{bes''8 fis''4}
\time 3/8
e'8\pp-\markup{\italic "doux"} e''8 r8
\time 4/4
cis''16 a' \tuplet 3/2{ b'' fis'' d''} \tuplet 3/2{b'16\staccato r16 a''16\staccato~} \tuplet 3/2{ a''32 r32 a'16\portato r16} r16. gis'32-> dis''16-> r16 \tuplet 3/2{ a'8 f'4}
r8 e'8->\mf r8 e''16 g'' \tuplet 4/3{ e''8~ <c'' e''> <g' c'' e''>~ <d' g' c'' e''>} bes16\staccato\mf r16
\time 7/8 e''16-> r16 cis'' r16
r8 bes'8 r8 r8 \tuplet 3/2{ e''16 g' des'}
\time 3/8
\crossStaff {\grace{f'16 g' a' e'' ges'32 e'32 ges,,16} } b''4.\fermata
}
\new Staff {
\clef bass
r1 r1
\tempo 4=88
d'4^\markup{\huge "molto ritard."}\startTextSpan\sustainOff\!\p-\markup{\italic "doux"} r4 \tuplet 3/2{ c'8 bes aes} r8 d'8-> r8 f8 \tuplet 3/2{ bes d' f} \tuplet 3/2{ r8 d'4} r8 d8
\tuplet 3/2{ r4 aes8~} \tuplet 3/2{aes d' f} \tuplet 3/2{bes d' f} \tuplet 3/2{ bes8 d4} r4 bes,4\staccato]\pp \tuplet 3/2{b,4 r8\stopTextSpan^\markup{\huge"tempo"} } r4
r4 r4 r8 aes,8\p~ \tuplet 3/2{aes,4 r8}
r1 r1 r1 r1 r1 r1 r1 r1 r1 r1 r1
r8 r8 r8 r8 r8 r8 r8
r1 r1 r4. r1 r1 r1 r1 r1
r4. r4 r4.
r1 r1
r4. r2
r4.
}
>>
}