extra note head

[Jack Wilson]

> I'm not top posting.

% I want to be able to use chords here
% in order to create accurate midi files
% but if I do, the layout is wrong
% reference: Snippets - Guitar strum rhythms

\version "2.18.2"

\new Voice \with {
  \consists "Pitch_squash_engraver"
} {
  \improvisationOn
  % chord causes extra note head to be produced
  a b < c e g > d
}