[NTG-context] Line spacing with a large font?

The title page of a book of notes contains {\tfe This is the title of my book} where I have previously defined \definebodyfont[10pt,11pt,12pt][rm][tfe=Bold at 32pt] However, the title is long and is broken into two lines, which are squashed together vertically. How can I ensure that \tfe uses more interline space? Thanks, Alasdair