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Standard staves only use one instrument each. Thus, all the notes of a given staff are played with the same instrument.

With Harmony version 6.0 and Melody version 4.0 it is now possible to relate several instruments to a single staff.

You can decide, for example, that on a staff playing the violin instrument, some notes will be played with the cello.

Any regular staff (treble, bass, or C key) can be related to several instruments, but the greatest benefit is that it makes standard drum staves possible.

To differentiate notes played on different instruments, a link is made between the graphical display of the note and the instrument. This link, completely user-defineable, is called a rule.
 

Note :  If you have used a previous version of Melody or Harmony, this new feature will not bother you. Everything you may have learned about the normal functioning of staves and instruments remains true. Previous "drum staves" are simply called "grid drum staves" from now on, to avoid confusion.

What is a rule ?

An unlimited number of rules can be associated with each staff. Rules will define which instrument notes are played on.

A rule is defined by :

• Its name : it is recommended that you give an explicit name to each rule, for example the name of the associated instrument.
• The criteria for falling within its scope
• The instrument used to play the notes
• Special options

• The shape of note head
• Note pitch
• Note color
• note velocity

Note :  If several criteria are defined for a rule, a note will follow this rule only if all the criteria are met.  If a note is subject to several rules, the first rule in the list is applied.  It is better however not to define ambiguous rules (in this case, add another criterion).

In the above example, we have defined that diamond head notes will be played on the Piano instrument, and square head notes will be played on the Clavecin (harpsichord).
The caption is automatically written below the first note that follows this rule.

Rule sets can be saved in independent files, and reloaded. The extension for these files is .Lex. Thus, you can define the most commonly used rule sets and apply them on demand to your staves.

How do I edit the rules associated with a staff ?

In the Staff menu, select Edit rules, or in the staff pop-up menu, select "Edit rules". The rule definition window opens. (Keep in mind that you are editing rules for this staff only. You can have as many staves with rules as you want in the same document.)

At the top of the window, you can see the rule set for this staff. Click on an item in the list to edit the rule.
 

Tip:  You can move an item up or down the list (and so alter its priority) by Command-click (Macintosh) or right-click (PC).

Beneath this the Delete and Add buttons delete or add a rule to the rule set.
The Purge button deletes unused rules from the rule set.

At the bottom is found the definition of the rule: its name, criteria, associated instrument and optional parameters.

• The rule name differentiates one rule from another, it is the name that will be displayed as a caption on the staff. The caption can be displayed once per score, at each line break or for every note. You can also disable it. If possible, the captionis displayed above the staff. Otherwise, it is displayed below.
• The criterion can be head shape, pitch, color or velocity.

 

 

Head shape is the simplest criterion to use, whatever the instrument related to your rule is (drum instrument or not). If you do not want your rule to be conditioned by the head shape, select the "any shape" check box.

Pitch : If you do not want your rule to be conditioned by the pitch, select "Any pitch".
This criterion can be used for building  standard drum staves or alternate tuning. Other examples are provided in the chapter Rules : advanced features

Color can be use whatever the instrument is.  If you do not want your rule to be conditioned by the colour of the note, select "any color".  Only a few colors are available to define a rule, to avoid confusion on the staff.

Velocity : If you do not want your rule to be conditioned by the note velocity, select "Any velocity"
Examples of user for this criterion are provided in the chapter Rules : advanced features

• The instrument can be any of the instruments in your score.
• Optional parameters enable you to alter the way notes are played. You can for example set a delay, an effect or a grace note to all notes following this rule. You can also select the look of the notes generated when you use the "Split staff according to rules" option in the staff contextual menu.

Note :  If you define two rules with identical criteria, they will be displayed in red in the rule set to help you track them.

Advice :  If you define rules that are related to note color, remember the coloring tool enables to color notes according to their pitch. In the same way, FaSoLa (shape note) mode change the note head shape according to its pitch.

Important :  If you change a rule's criteria while one or several notes are already following it, these notes will be adapted to follow the new rule.

Example of use

On a regular staff playing the "Piano" instrument, we are going to add a rule so that red note play with an "Organ" sound.

• Open the contextual menu for this staff 
• Select "Edit rules"
• Type in a name for this rule (for example 'Organ notes")
• Select bright red in  the color pop-up menu (under the button "all colors"). "All colors" must not be checked.
• Select an instrument (bottom-right) for these notes. If Organ does not already exist in your instrument list, create it with "New instrument".

Do not forget to call it "Organ" and to select the right sound (for example Organ - Church Organ 1").
• Click OK. That is all.

Important :  From Melody Assistant 5.1 and Harmony Assistant 7.1, a default effect processor can be related to each instrument. In case of staves with rules, the whole staff uses the effect processor defined in the default instrument (can be edited by clicking the  icon in the staff margin).

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