Duet v1.0 by Carl Gibbons

"Bring the Torch, Jeanette Isabella!"

To get the song data list on the stack, press SONG,
then execute  OBJ->  or  STR-> .
Then just press  PLAY.  If you're using an HP48S/SX,
you should hear a slow tenor duet.  If you're using
an HP48G/GX, you should hear a rousing alto duet.

The music maker is the other program, BR2.  It takes
three real numbers from the stack:  two frequency delay
counter from levels 2 and 3, and a duration delay
counter from level 1.