piano scale
D altered
D1E♭♭2F♭3G♭♭4A♭♭5B♭♭6C♭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
DHE♭WFHG♭WA♭WB♭WCWD
What is true of it
D altered is D, E♭, F, G♭, A♭, B♭ and C, and back to D.
Its steps are H – W – H – W – W – W – W, where W is a whole step and H a half.
On the same tonic, D Locrian differs from it by exactly one note.
Chords made only of these notes
CdimdiminishedCm7♭5half-diminished seventhDdimdiminishedDaugaugmentedDm7♭5half-diminished seventhE♭mminorFmminorFm7minor seventh
Found by testing every chord in the catalogue against these 7 sounds, not chosen.