\version "2.13.60"

relativeMode = \relative c' {
  \chordGlissando
  <f\3 a\2 c\1> <c\3 e\2 g\1>8
}

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

absoluteMode = {
  \chordGlissando
  <f'\3 a'\2 c''\1> <c'\3 e'\2 g'\1>8
}

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