Bandcoach Help!!!

[SupHolmes]

I was watching a tutorial I know the scale is Db Major and he's using the I IV and vi chords but they are not triads, what are these chords? For example the IV chord is Gb Major: Gb Bb and Db but he's not playing those notes exactly please help!!

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[bandcoach]

so this is why him not telling you all about what he is doing doesn't help you

I've watched until about 12 minutes in and the following comes through

starting at 2:17

vi
Bb9sus4 - Bb-F-Ab-Bb-C-Eb as opposed to Bbm9 Bb-F-Ab-Bb-C-Db

i.e. the chord is now a dominant 9th with suspension rather than a minor chord

IV
Gb6/9 no 3rd - Gb-Db-Ab-Db-Eb-Ab as opposed to Gb6/9 Gb-Db-Ab-Bb-Db-Eb-Ab

because there is no 7th this a 6/9 chord rather than a 13th. Lacking the 3rd it is difficult to assign function to it as it is a wandering type of chord - there is no clear direction for the chord to move in

the passing chord - I
Db13 - Db-Ab-F-Bb-B-Eb - the B is actually Cb in the key of Db - this is a dominant 13th chord which runs counter to our expectations of a maj7 flavour

the walk up
A-Bb-C
F-G -A

suggestive of F-Gm-Am or Dm-Eb-F or Bbmaj7-C/Cm7-D7/Dm7

11:52
then he gets a bit mad and starts doing stuff outside of the chords he suggests as "all you will need"

that first chord is D-F-B-D-F-Bb, suggestive of Bbadd b9

I'll work on this over the next few days as there is a lot to pull out and notate accurately - I may have to actually do screen shot by screen shot to get some of the chords he is playing