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Structure of a style  

 Style file - The Style File Format is Yamaha's original style file format which uses a unique conversion system to provide high-quality automatic accompaniment based on a wide range of chord types.
 A style consists of several sections. Usually the structure of the style includes two basic musical variations. These parts are called Main A and Main B. As a rule, the basic style playing is carried out in these sections. As an example it is possible to take any song - usual song structure is having sing, refrain, sing, refrain etc. The sing can be in Main A and refrain is in section Main B. In a real music composition there are some inserts between the sing and the refrain. There are 4 sections of inserts: Fill In AA , Fill In AB , Fill In BB , Fill In BA . And there are 2 sections of introduction (called Intro A and Intro B) and 2 sections of song end (called Ending A and Ending B).
In more senior models than PSR-630 and PSR-730 there are additional sections Break AA and Break BB.
In new models PSR from Yamaha (PSR-640, PSR-740 and PSR-9000) the structure of a style can include four basic variations: Main A, Main B, Main C and Main D. Inserts Fill In CC and Fill In DD are also added. Read your keyboard manual to define the section names, supported by your PSR. However the practice of using of ready styles shows that superfluous section in a style file in any way do not prevent for correct playing of style on PSR.

Section
Each section represents the completed musical fragment with observance of certain rules. For example the basic section (Main A and Main B) are created in such way, that while cycling this section there is the impression of the uniform musical execution. All others sections are executed unitary by pressing the appropriate button on PSR and after their end again there is one of two basic variation. Each of sections is written down in determined chord root (basic note) . When your PSR distinguishes chords entered by a user, it automatically changes playing under the certain laws, which we shall discuss further.

Style files
Yamaha styles are stored as files of the standard SFF (Style File Format). The basis of style makes usual MIDI messages. Thus in the beginning of a SFF file (*.sty) there is a MIDI file of the standard SMF0 (Standart MIDI File 0).
Then at the end of the MIDI file the extended information of style is added. This part of the file begins from the four-byte heading "CASM" and it will be quite logically enough to name it as the CASM part of style. So Casm Edit helps you to edit the Casm part of the file. More successful creation of styles needs understanding of CASM parameters.

Section in a file
In a style file all of sections are written down consistently in the following sequence:

Main A
Fill In AA
Fill In AB
Intro A
Ending A
Main B
Fill In BA
Fill In BB
Intro B
Ending B
The beginning of each style is marked by a Marker. The Marker is a standard MIDI - files concept. It represents the text placed in a certain time position. For correct work of style there should be two markers at the beginning of a file: SFF1 and SInt. The section Main A begins only in the second measure (SFF1 and SInt are the first measure). In some senior models of PSR two sections Break AA and Break BB are supported:

Main A
Fill In AA
Fill In AB
Intro A
Ending A
Break AA
Main B
Fill In BA
Fill In BB
Intro B
Ending B
Break BB