\override TimeSignature.stencil = ##f Does this not work anymore?
\score { << \new Staff \relative c' { \override TimeSignature.stencil = ##f \time 2/4 c4 c4 \time 3/4 c c c \time 2/4 c c \bar "|." } >> } ... still shows time signatures. TimeSignature.transparent has no effect either. hjh