Voicings

Cdim7

Diminished 7

Close position
C4 Eb4 Gb4 A4Loading piano…
  1. C4R
  2. Eb4b3
  3. Gb4b5
  4. A4bb7

Guide tones carry the chord's sound: the 3rd (4th on sus chords) and the 7th (or 6th).

Source: Common practice