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