Yamaha Mobile Owner's Manual page 13

CHORD
When playing phrases, Mobile Music Sequencer ensures that they follow the
chord changes set for the corresponding section. In order to do this, it needs
to know each phrase's original chord root and type. This information can be set
using the Source Chord Editor.
Phrase's original chord root and type
Phrase
Chord change
Chord set for the section
NOTE
The original chord root and type of preset phrases cannot be edited.
The Source Chord Editor can be opened by tapping [CHORD] in Step 4 above.
1 Area 1 is used to set the chord root.
2 Area 2 is used to set the chord type, and it can be scrolled horizontally.
Mobile Music Sequencer Owner's Manual
Phrase based on the new chord
3 In Area 3, you can set one of the following chord-change types for the
phrase.
Melody1 This type limits the effect of chord changes, making it ideal for
melodic phrases. In specific terms, the phrase will be converted or
transposed based on the chord types and roots set for the section.
Melody2 As above, this type also limits the effect of chord changes and is
ideal for melodic phrases. In response to chord changes, Mobile
Music Sequencer shifts the phrase's notes as little as possible for
smoother chord progressions.
This type significantly changes the phrase, making it ideal for
Chord1
backing tracks. In specific terms, the phrase will be converted or
transposed based on the chord types and roots set for the section.
Chord2 As above, this type also significantly changes the phrase and is
ideal for backing tracks. In response to chord changes, Mobile
Music Sequencer shifts the phrase's notes as little as possible for
smoother chord progressions.
Bass This type is ideal for bass phrases.
Bypass When this type is selected, the phrase is unaffected by chord
changes. As such, it is perfect for drum phrases.
Para This type causes the entire phrase to be transposed based on the
new chord's root note, but the chord type is ignored. As such, it is
suitable for phrases that already include chord changes.
4 HIGHEST KEY from Area 4 is used to set the highest possible root note.
If set to G, for example, chords with a root note higher than G would be
transposed down an octave.
HIGH LIMIT and LOW LIMIT define the range in which the phrase will be
played. Any notes outside this range will be moved into it by transposing up
or down accordingly in octave steps.
5 Area 5 is used to specify whether the phrase should be retriggered (i.e.,
started again from the beginning) in response to chord changes.
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