Here are a few words about available settings for the scale fingering engine of the app. The same engine is used for chord arppegios as well, and the app handle two distinct sets of settings: one for scale fingerings and one for arpeggios.
Span by string
This is the widest fret range allowed on each string. It can be less however. Think of it as the maximum extension of your fingers.
Minimum notes by string
This is the lowest number of notes allowed on each string. If you specify 0, string can be jumped since fingerings with strings with 0 notes (hence jumped) will be allowed. You may use this value to restrict to fingerings with a specific number of notes by strings by matching this setting with the maximum notes by string. Of course, this value should be smaller than the span by string.
Maximum notes by string
This is the highest number of notes allowed on each string. Of course, it as to be at least equal to the minimum notes by string, and at most equal to the span by string.
Maximum difference by string
This sets the maximum difference of played notes from one string to an adjacent one (before or after). If you specify 0, all strings must have the same number of played notes.
A special prescription on the parity (even or odd) on the number of played noted by string can be specified. For example, if you select odd, only fingerings with an odd number of notes (1, 3, 5, etc.) by strings will be generated. It can be useful if you play with a pick and want to practice certain configurations.
Maximum backward and forward offset
The app check the fret of the first played note on each string. These settings allow to limit the difference of such frets between a string and the next one. Backward means toward the nut, and forward, toward the bridge. These properties are outlined on the fretboard at the top of this page.
This is closely related to the maximum backward and forward offset settings. These limits are valid from string to its adjacent ones, but small steps can add up as the strings are played, and the fingering may end at a very different position. If the static fingerings option is engaged, the app will allow only one unit of offset at most for the whole fingering. For example, if you set the maximum backward offset to be 1, it means that the fingering can go toward the nut of 1 fret at most each time you change of string. If it started at the 5th fret on the top string, it can go as far as the 4th fret for the next string, then as far as the 3rd fret on the following one, and so on. If static fingerings are required, if it start at the 5th fret, any other string (and not only the next one) will be played at least at the 4th fret. This setting is especially useful when working with scale fingerings when one look for block patterns. This is less true for chord arpeggios.
You can use this setting to force fingerings to go in one specific direction when passing from strings to strings (if ever they move). For example, if the bridge direction is selected, from string to string, the first fret played will be at least the first fret played of the current string. Never less.
Imagine that you are currently at one position on the neck, playing the F of the C major scale. You know that the next note will be a G. In order to sound naturally, the G should be the immediate G following the F you’re playing. However, all the settings above may allow to reach a G which is one octave higher than the expected G. If the Octave changes setting is set to natural, this higher G will be discarded and the app will look exclusively for G’s at the “right” pitch. If ever the can jump value is selected, fingerings jumping from the F to this high pitched G will be generated too.
This setting appears only for chord arpeggios. There is a fundamental difference between scale fingerings and chord arpeggios: scales are defined on 1 octave (12 semitone), whereas chords are commonly requiring 2 octaves (24 semitones). For example, for a C9 chord, the 9th is the
D one octave higher than the root
C. The chords notes are
C E G B D. If we arpeggiate it starting from
C3, one starts with
C3 E3 G3 B3. The next note should be
D4, but there is a
C4 reachable before it. If we are rigorous, one bypass it to go directly to
D4, but the next note is then the C coming after
D4, that is
C5 an we completely bypassed
C4 as well as
B4. This is a perfectly valid way to do, but it is not very efficient. For chord arpeggios, the app has an option to “fold” chords and generate arpeggios for which chord notes on the neck are ordered by their pitches and not by their position in the chord. As a result, if the folded value is selected, the app will generate arpeggios of the form
C3 D3 E3 G3 B3 C4 D4 E4 G4… otherwise, of the form
C3 E3 G3 B3 D4 C5 E5… if the strict order value is selected.