Watch the C7 b9 Chord Inversions online guitar lesson by Frank Vignola from Inversion Excursion
The spelling of a dominant flat 9 chord is C-E-G-Bb-Db or 1-3-5-b7-b9. I look at these 4 string inversions very simply, as a diminished chord. 3-5-b7-b9 is a diminished chord. If you move a diminished up three frets it is your next inversion. So, this is a simple way to look at the 4 note, 4 string dominant flat 9 inversions. We also look at adding the C or Root to these 4 string b9 or diminished chords. We go through a bunch of the C dominant b9 inversions in this segment and move on to even more in part 2 after the performance segment. For each inversion, look at the chord and pick out each of the chord tones naming the notes.