Neighbours of Cdim
Every chord one voice of Cdim reaches by a semitone or a whole tone, on C and so for every root: the voice that steps, the notes that result, and what they spell.
Cdim holds C Eb Gb. 6 chords are one semitone away and 6 chords are one whole tone away; 4 of them spell a chord type and 0 realise a transform a source names.
One semitone away
| Voice | Steps to | Notes | Spells | Named transform |
|---|---|---|---|---|
| C | B, -1 | B Eb Gb | B | none named |
| C | C#, +1 | C# Eb Gb | no chord type | none named |
| Eb | D, -1 | C D Gb | no chord type | none named |
| Eb | E, +1 | C E Gb | no chord type | none named |
| Gb | F, -1 | C Eb F | no chord type | none named |
| Gb | G, +1 | C Eb G | Cm | none named |
One whole tone away
| Voice | Steps to | Notes | Spells | Named transform |
|---|---|---|---|---|
| C | Bb, -2 | Bb Eb Gb | Ebm | none named |
| C | D, +2 | D Eb Gb | no chord type | none named |
| Eb | Db, -2 | C Db Gb | no chord type | none named |
| Eb | F, +2 | C F Gb | no chord type | none named |
| Gb | E, -2 | C Eb E | no chord type | none named |
| Gb | G#, +2 | C Eb G# | Ab | none named |
No source this site cites names a transform for this chord type, so every step here stays unnamed.