Your snippet doesn't include the Span_stem_engraver, so I guess you lost that when adding the Dynamics. Here is an extracted part of the score of that I am just now working on, with /lots/ of cross-staff joins as well as central dynamics:
\score { << \new PianoStaff \with { \consists "Span_stem_engraver" } << \set PianoStaff.instrumentName = \markup\bold"Piano I" \new Staff = "priRH" { \clef treble \IpriRH } \new Dynamics = "priDy" \IpriDy \new Staff = "priLH" { \clef bass \IpriLH } >> >> } Regards, Paul From: Alberto Simões <albertov...@gmail.com> To: <lilypond-user@gnu.org> Sent: 25/06/2022 21:17 Subject: CrossStaff and Dynamics Hello I am using CrossStaff and everything worked fine. But after following a snippet that suggest adding the dynamics as an independent voice of spaces: \score { \new PianoStaff = "PianoStaff_pf" << \new Staff = "upper" << \upper >> \new Dynamics = "dynamics" \dynamics \new Staff = "lower" << \lower >> >> } the beams are no longer connected. Is there any way to overcome this problem? The idea of using a dynamic "voice" was to get all dynamics middle-aligned between them... Thank you for any hint, Alberto