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When a taut string vibrates, the frequency of the sound produced is inversely proportional to the length of the string.
Some instruments are based on this principle, for example the harp or piano. In these cases, the large number of strings necessary to give an adequate number of notes leads to a bulky instrument.

To avoid this, it is necessary to be able to produce several notes with a single string.This is made possible by shortening the string before making it sound. It is the principle used in the violin : the performer puts his fingers where necesaary to generate the correct note. It needs however great accuracy in fingering.

Another kind of instrument, called a fretted string instrument, uses an ingenious system to shorten the strings in a simpler way for the performer.
A series of strings is held taut over a neck. Each string produces a specific pitch (frequency) when plucked . On the neck, there is a series of metallic bars called frets.

When the finger presses a string behind a fret, the string is held against the fret and so shortened : the note generated is more high-pitched.
Frets are placed so that each corresponds to a semitone. That is all.

Presentation

The music is presented in a tablature. There are as many horizontal line in a tablature as there are strings, with the highest pitched (treble) at the top.
Each note is written as the number of the fret at which it is played. An open string is notated 0, the first fret 1 and so on.

The performer reads the tablature from left to right, each note being written on the corresponding string and fret. When two notes are displayed in the same column, they are played at the same time.

There are often several positions on the neck at which the same note could be played. Hand and finger positions must then be optimized to avoid unneccessary movement up and down the neck. The software computes the simplest path to play the given notes.

Inserting notes

To insert notes into a tablature, several methods are available :

You can select the fret with the keyboard (numerical pad), then click on the required string. A list of keyboard keys for  tablature editing is provided in the keyboard configuration (they can be redefined).

You can click on a string with the Shift key held down (or with the right mouse button). You can then select the fret in the pop-up menu.

A list of about fifty predefined instruments is available in Harmony-Melody.
You can also define your own : click "Other" and choose for each string :

the note pitch for the open string

the number of frets for this string

the first useable fret for this string : on some instruments, such as the banjo, one string is shorter than the others.

Tablature computation,  i.e. the association between a note and the corresponding string-fret pair, is largely configurable.

For each note, the context is analyzed and all possible fingerings for this note are evaluated. A difficulty value is calculated for each of them. The higher the value, the worse the fingering.
You can define the penalties (positive values) or advantages (negative values) that will be applied

If a note cannot be played, it is displayed as a question mark.
 

• You can set a capodastro : this is a kind of clip fixed across the fingerboard to shorten the instrument neck temporarily. You can select the fret number at which this clip is set.
• Maximum gap : this is the distance in frets between the two extreme fingers of the hand. When the distance that has to be spanned  on the neck becomes greater than this value, the fret changing penalty is applied.
• Fret changing penalty : this penalty enables you to limit  moves up or down the neck. The higher the value, the fewer the movements on the neck.
• Empty string penalty : a penalty applied when a string is played open. If, however, you want to favour open strings, set a negative penalty (an advantage).

String changing penalty : used to limit moves across the neck. The software gives preference to staying on the same string instead of playing the note on a different one. It favours moves of the hand along the neck. A negative values does the opposite.

Note :   Using "negative penalties" can slow down the tablature calculation process.

• Calculation depth : Notes are processed in groups of specifiable length. A group of notes also ends when a rest is found, because it is presumed that a rest gives the performer time to move his hand on the neck. If this value is high, computing time may be longer.
• Arpeggio with the right hand : Sometimes, notes are played rapidly by using a right hand arpeggio rather than fret changes with the left hand.In this case, beamed notes with a duration of less than an eighth note are considered to be a chord.



Note :   When tablature is being computed, the mouse pointer becomes a watch with "Tab". You can cancel calculation by pressing the Apple key (Mac) or Ctrl (PC) and clicking.

 

Baroque tablature  uses letters instead of numbers. An open string is marked with an 'a', the first fret with a 'b' then the characters r,d,e,f,g,h,i,k,l,m,n,o,p,q,s,t,u,v,w,x,y,z.
To avoid confusion some letters like c and j have been omitted or replaced. In particular, note that the letter "r" is used for the second fret instead of "c": this is because during the baroque period the printed letter "c" looked like a modern "r".
Baroque notation only displays the first (highest) six strings on the tablature grid, although an instrument like the Baroque Lute can have up to 14 strings.
Bass strings lower than the sixth are written below the bottom line of the tablature, and are differentiated by a / symbol drawn before the fret letter. The seventh string just uses the fret letter, then there is one '/' for the 8th string, two '/' for the 9th, three '/' for the 10th, then the number '4' for the 11th, '5' for the 12th...
When you click with the Shift key depressed (or right-click) below the sixth string, Harmony-Melody lists all available choices in the pop-up menu.
 
Mountain or Appalachian Dulcimer tablature

The mountain dulcimer is a fretted instrument that generally has 3 strings and about 20 frets. The fret spacing follows a diatonic scale and is therefore irregular (it can be either one semitone or one tone).
To define your own Dulcimer tuning, select "Other" in the tablature selection window and switch to "Dulcimer" mode (pop-up menu at the bottom of the window).

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