Midi_event::str () const
{
Rational rat_dt = (delta_mom_.main_part_ * Rational (384) +
- delta_mom_.grace_mom_ * Rational (100))*Rational (4);
+ delta_mom_.grace_part_ * Rational (100))*Rational (4);
int delta_i = int (rat_dt);
String delta_str = Midi_item::i2varint_str (delta_i);