Generalmusic 271221 Owner's Manual page 153

INSERT BARS
This feature allows you to increase the length of the current song
by inserting a number of extra measures at a particular point.
These new measures can even have a different time signature
from the rest of the song.
DELETE BARS
This feature allows you to delete a number of measures from
any point in the song. Unlike the ERASE EVENTS function, when
you delete events using DELETE BARS, it does not leave an
empty space in the song. The measures which existed before
and after the deleted section will be "spliced together" when the
operation is performed.
Sequencer 11•21