Akai MPC X User Manual page 143

The Delete Bars function removes a range of bars from a
sequence.
To select the sequence whose bars you want to
delete, use the Sequence field.
To set the range of bars you want to delete, use the
First Bar and Last Bar fields. The bar in each field and
all bars in between them will be deleted.
To confirm your choice, tap Do It.
To return to the previous screen, tap  Back or
anywhere outside the window.
To cancel and return to Main Mode, tap Cancel.
The Insert Bars function adds empty bars to a sequence
at a specified point.
To select the desired sequence, use the Sequence
field.
To set how many bars you will insert, use the # of
Bars field.
To set the time signature of the inserted bars, use
the two Time Sig fields.
To set where you will insert the bars, use the Before
Bar field. The bars will be inserted before this one.
To confirm your choice, tap Do It.
To return to the previous screen, tap  Back or
anywhere outside the window.
To cancel and return to Main Mode, tap Cancel.
The Half Length function will immediately halve the
length of the sequence (without deleting any note events).
The Double Length function will immediately double the
sequence and copy all events from the first half to the
second half.
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