\version "2.13.60"

nonRelativeInput = {
  \chordGlissando
  <bes cis' fis'>8 <b\3 d' g'>
  % octave is OK
  \chordGlissando
  <bes cis' fis'>8 <b\3 d' g'>
}


relativeInput = \relative c' {
  \chordGlissando
  <bes cis fis>8 <b\3 d g>
  
  % need octave check, otherwise it jumps one octave higher
  \octaveCheck c'
  \chordGlissando
  <bes cis fis>8 <b\3 d g>
}

\new StaffGroup <<
  \new Staff { \clef "G_8" \nonRelativeInput }
  \new TabStaff { \clef "moderntab" \nonRelativeInput }
>>

\new StaffGroup <<
  \new Staff { \clef "G_8" \relativeInput }
  \new TabStaff { \clef "moderntab" \relativeInput }
>>