This unique tuning, aptly named "All-Fourths Half Step Down," combines the highly logical interval structure of an all-fourths tuning with significant deviations on its higher strings, all while lowering the overall pitch. Primarily, the lowest four strings (6th through 3rd) are tuned in perfect fourths: D3#, G3#, C4#, and F4#. This consistent interval spacing simplifies the fingerboard layout, making it "more logical" as described, where scale patterns and chord shapes can be transposed across these strings without adjustment.

Technically, an ideal 'all-fourths half step down' from standard E-A-D-G-C-F (or B-E-A-D-G-C) would result in a D#-G#-C#-F#-B-E sequence across all strings, maintaining the perfect fourth interval. However, this specific tuning deviates significantly on the higher strings. While the lower four strings maintain the perfect fourth relationship, the 2nd string is tuned to B2, a substantial drop of two full octaves from the expected B4 that would preserve the all-fourths pattern from F4#. The 1st string is tuned to E4, which is then two octaves and a perfect fourth above the B2.

This configuration leads to a tuning that is largely all-fourths for the bass strings but highly unconventional in the treble. The overall pitch is lowered by a half step compared to a natural all-fourths tuning, contributing to a darker, perhaps heavier tonal quality. The open string notes (D3#, G3#, C4#, F4#, B2, E4) do not form a common open chord, suggesting a landscape for complex or dissonant voicings. However, the consistency of the perfect fourths on the lower strings can still be exploited for easy transposition of bass lines and power chords. The drastic interval changes on the higher strings will require a player to adapt their fingering significantly for lead lines and chord voicings in that register, offering unique sonic textures and extended range on the 2nd string.

Tuning Notes

• String 6 (Low E String): D3#
• String 5 (A String): G3#
• String 4 (D String): C4#
• String 3 (G String): F4#
• String 2 (B String): B2
• String 1 (High E String): E4

How to Tune

To achieve the "All-Fourths Half Step Down" tuning, follow these specific string adjustments from standard guitar tuning (E-A-D-G-B-E):

• String 6 (Low E): Tune down 1 semitone to reach D3#.
• String 5 (A String): Tune down 1 semitone to reach G3#.
• String 4 (D String): Tune down 1 semitone to reach C4#.
• String 3 (G String): Tune down 1 semitone to reach F4#.
• String 2 (B String): Tune down 12 semitones to reach B2. Caution: Tuning down 12 semitones is a full octave drop. This significant change in tension may require a heavier gauge string to avoid floppiness and ensure optimal tone and playability.
• String 1 (High E): Keep as is; no change (0 semitones) to remain at E4.