This is a deeply resonant and highly experimental guitar tuning, crafted to explore new sonic territories. As described by its creator, it's an "experimental tuning" designed for unique soundscapes. It involves significantly dropping all six strings, culminating in a very deep C2 on the lowest string. This creates an incredibly rich, dark, and heavy foundation, making it particularly well-suited for genres like doom metal, drone, ambient, and experimental rock, where a powerful, low-end emphasis is paramount.

Technical Analysis:

• Instrument Type: Guitar
• Open Notes: C2 F2 A#3 F3 G3 D4 (C F Bb F G D)
• Interval Relationships (low to high string):
  • String 6 (C2) to String 5 (F2): Perfect 4th (P4, 5 semitones)
  • String 5 (F2) to String 4 (A#3/Bb3): Octave + Perfect 4th (P11, 17 semitones) – a very wide interval!
  • String 4 (A#3/Bb3) to String 3 (F3): Perfect 4th (P4, 5 semitones) – Note: F3 is 5 semitones below A#3/Bb3.
  • String 3 (F3) to String 2 (G3): Major 2nd (M2, 2 semitones)
  • String 2 (G3) to String 1 (D4): Perfect 5th (P5, 7 semitones)

The overall intervallic structure, featuring multiple perfect fourths and fifths, alongside a repeated F note and a particularly wide jump between the 5th and 4th strings, creates an open and versatile foundation. The deep tuning of all strings means that the tension will be considerably lower than standard, and heavier gauge strings are highly recommended, especially for the strings dropped by four semitones, to ensure optimal playability, intonation, and tone.

Open Chords and Harmonic Possibilities:

This tuning readily offers some intriguing open chord voicings and melodic opportunities:

• B-flat Major 7th (Bbmaj7) Voicings: The notes F2, A#3 (Bb3), F3, and D4 are present across strings 5, 4, 3, and 1 respectively. This combination (F Bb F D) forms a strong open Fsus4 chord, or specifically, a Bb Major 7th chord (Bb D F A#) without its root. By simply fretting the 6th string to B-flat (6th fret), a full and rich open B-flat major 7th chord becomes easily accessible, providing a lush harmonic texture.
• Low Power Chords: The deep C2 and F2 on the lowest two strings make for incredibly powerful and resonant open C5 (C-G, fretting string 5 to G) or F5 (F-C, fretting string 6 to C) power chords. The open C2-F2 interval itself is a strong Perfect 4th, creating a foundational, driving sound perfect for heavy riffs and droning textures.
• Dsus2/4 Variations: The higher strings (G3, D4) form a perfect fifth. Combined with the F3, they can create interesting suspended voicings like Dsus2 (D E A) or Dsus4 (D G A) with the addition of fretted notes, offering bright, open harmonies despite the overall low tuning.

How to Tune:

To achieve the "CFA#FGD Experimental Tuning", you will need to significantly detune all of your strings from standard EADGBe. Due to the substantial drop in pitch for most strings, particularly those dropped by 4 semitones, it is highly recommended to consider using a heavier gauge string set to maintain proper tension and intonation. Proceed with care, especially when dropping strings by multiple semitones.

• String 6 (Low E to C2): Tune down 4 semitones. (Note: A substantial drop; consider a heavier gauge string.)
• String 5 (A to F2): Tune down 4 semitones. (Note: A substantial drop; consider a heavier gauge string.)
• String 4 (D to A#3): Tune down 4 semitones. (Note: A substantial drop; consider a heavier gauge string.)
• String 3 (G to F3): Tune down 2 semitones.
• String 2 (B to G3): Tune down 4 semitones. (Note: A substantial drop; consider a heavier gauge string.)
• String 1 (High E to D4): Tune down 2 semitones.