guitar scale
G altered
G1A♭♭2B♭♭3C♭♭4D♭♭5E♭♭6F♭7
The seventh mode of melodic minor. Every degree above the tonic that can be altered, is.
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
GHA♭WB♭HC♭WD♭WE♭WFWG
What is true of it
G altered is G, A♭, B♭, C♭, D♭, E♭ and F, and back to G.
Its steps are H – W – H – W – W – W – W, where W is a whole step and H a half.
On the same tonic, G Locrian differs from it by exactly one note.
Across the first twelve frets of the guitar its notes fall in 44 places, which is what makes a scale a shape rather than a list.
Chords made only of these notes
D♭majorD♭7dominant seventhE♭majorE♭augaugmentedE♭7dominant seventhFdimdiminishedFm7♭5half-diminished seventhGdimdiminished
Found by testing every chord in the catalogue against these 7 sounds, not chosen.