The Abyssal F# Drop 7 tuning plunges your 7-string guitar into exceptionally low territory, offering a profoundly heavy and unconventional sonic landscape. While the JSON describes it as a "drop f# 7-string" derived from a "drop a 7 string tuning tuned down 3 half steps," the resulting string intervals are highly unique and diverge significantly from typical drop tunings.

Technical Analysis:

This tuning is characterized by the following note sequence from the thickest (7th) to the thinnest (1st) string:

• 7th String: F#2 - An extremely low F#, forming the foundation of this powerful tuning. This provides a deep, guttural tone for heavy riffs.
• 6th String: C#3 - A perfect fifth above the 7th string F#2, creating a robust F#5 power chord when played with the low F#.
• 5th String: F#3 - An octave above the 7th string, completing a powerful F# triad or an extended F# power chord voicing on the lowest three strings. This allows for rich, full low-end voicings.
• 4th String: B2 - This is the most unconventional aspect of the tuning. Pitched lower than both the 5th (F#3) and 3rd (E3) strings, the B2 on the 4th string creates a dramatic and unexpected dip in pitch. This introduces wide, descending intervals (a perfect fourth down from F#3 to B2) that challenge traditional chord shapes and open up possibilities for experimental, dissonant, or industrial-sounding voicings.
• 3rd String: E3 - A perfect fourth above the 4th string B2. This note is an octave lower than the standard 3rd string E4, contributing to the overall deep character of the tuning.
• 2nd String: G#4 - An augmented fifth (or major third plus octave) above the 3rd string E3.
• 1st String: C#5 - A perfect fourth above the 2nd string G#4, mirroring the interval between the 4th and 3rd strings.

The open strings provide a complex blend of intervals. While the low F# and C# on strings 7 and 6 immediately offer a strong F# power chord (F#5), and the 5th string F#3 extends this, the internal jumps, particularly the B2 on the 4th string, make this a challenging tuning for conventional open chords. However, these unique intervals could be exploited for very heavy, dissonant riffs, or for melodic lines that capitalize on the wide pitch range. The deep, non-linear progression makes it ideal for metal genres requiring a brutal, guttural tone, as well as for avant-garde or ambient compositions seeking unusual harmonic textures.

How to Tune:

To achieve this tuning, you will need to adjust your strings as follows. Please note the significant downward movements, which may require heavier gauge strings for optimal tension and intonation:

• 7th String: Tune down 5 semitones. (To reach F#2. This is a substantial drop from a standard B2; a heavier gauge string is highly recommended.)
• 6th String: Tune down 3 semitones. (To reach C#3.)
• 5th String: Tune down 3 semitones. (To reach F#3.)
• 4th String: Tune down 3 semitones. (To reach B2. Note: Tuning a standard D4 string down 3 semitones would result in B3, not B2. Achieving B2 from a standard D4 would typically require tuning down 15 semitones, suggesting a much thicker gauge string or a different base tuning for this string is intended.)
• 3rd String: Tune down 3 semitones. (To reach E3. Note: Tuning a standard G4 string down 3 semitones would result in E4, not E3. Achieving E3 from a standard G4 would typically require tuning down 15 semitones, suggesting a much thicker gauge string or a different base tuning for this string.)
• 2nd String: Tune down 3 semitones. (To reach G#4.)
• 1st String: Tune down 3 semitones. (To reach C#5.)

For any string requiring a movement of more than 4 semitones (either up or down), or if you are aiming for the exceptionally low B2 and E3 on the 4th and 3rd strings respectively, a different gauge string set is strongly advised to maintain proper tension, intonation, and to prevent string breakage or damage to your instrument.

The final open notes for the Abyssal F# Drop 7 tuning are as follows, from thickest (7th) to thinnest (1st) string:

• 7th String: F#2
• 6th String: C#3
• 5th String: F#3
• 4th String: B2
• 3rd String: E3
• 2nd String: G#4
• 1st String: C#5