- SCM met = tempo_req_->get_property ("metronome-count");
- Duration *d = unsmob_duration (tempo_req_->get_property ("tempo-unit"));
-
- Rational r = (d->get_length () / Moment (Rational (1, 4)) * Moment (ly_scm2int (met))).main_part_;
-
- audio_ = new Audio_tempo (int (r));