Boss BR-1180 Owner's Manual page 82

Using the Rhythm Guide
About the Drum Kits
"Drum kits" are collections of drum sounds, such as kick,
snare, hi-hat, cymbals, etc., which have been organized
according to the style of music they will most likely be used
for.
The BR-1180/1180CD comes with nine internal drum kits.
All you need to do is choose the kit that most closely fits the
kind of tune you have in mind.
About the Rhythm Patterns
0ne- to eight-measure units of rhythm performance data are
called "rhythm patterns."
The BR-1180/1180CD includes 294 different internal preset
rhythm patterns suitable for a wide variety of musical styles.
The preset rhythm patterns are grouped together according
to style, and further include "forms" for use in intros, fills,
breaks, and other sections of each style.
In addition to the preset rhythm patterns, you also freely
create maximum 999 rhythm patterns that can be saved to
the BR-1180/1180CD's hard disk as "user rhythm
patterns," and you can store up to maximum 999 rhythm
patterns to each song as "song rhythm patterns."
About Rhythm Arrangements
Rhythm patterns are no more than repetitions of one- to
eight-measure performances, so you cannot add variation
during the song or compose a song using only rhythm
patterns. However, with the BR-1180/1180CD, you can
create songs in the form of compositions using intros, fills,
endings, and other rhythm patterns that are arranged in
sequential order. These are called "rhythm arrangements."
Rhythm arrangements also feature a "tempo map function"
that allows you to set tempos for performances measure by
measure.
The BR-1180/1180CD holds 50 internal preset rhythm
arrangements.
You can also freely create ten rhythm arrangements that can
be saved to the BR-1180/1180CD's hard disk as "user
rhythm arrangements," and you can store up to ten rhythm
arrangements in each song as "song rhythm
arrangements."
Not only can you set up rhythm patterns in the user rhythm
arrangements, but you can use loop phrases as well.
For more on loop phrases, refer to "Using loop phrases."
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About the Loop Phrases
When composing a song, one method of creating a style for
the song is to first create a one- or two-measure phrase that is
repeated (a loop phrase), then arrange those to set up the
song's rhythmic framework.
The BR-1180/1180CD is also capable of this method of
creating music, meaning you can arrange and perform loop
phrases in whatever order you like while arranging rhythms.
You can store fifty different loop phrases to each of the "user
banks" (A–H), and fifty to each song's "song bank."
* For more on using the loop phrases, refer to "Using loop
phrases" (p. 92).