\remove Note_heads_engraver => no notes at all

[alexandros]

Hello!

Either I do not understand Note_heads_engraver correctly or I do
something wrong. In the following code I removed the Note_heads_engraver
and I expected to see only the stems and the beams. Instead of this,
stems and beams disappeared. Could you point the problem to me please?
Thank you for any answer or tip.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.12.2"


\score {
  \new Staff\relative c'{
    \new Voice \with{
      \remove "Note_heads_engraver"
    }
      c4 d e8 f g a
  }  
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Best Regards

Alexandros