Hi Alan,

When you said ...
Quote:

C4 is actually 1 4 b7 in BIAB which is just an inversion of the sus chord


... you got my interest piqued. This, in turn, got me looking for differences between the chords C4, Csus and Csus7 (entered as C7sus in BIAB).

What I did was to load a midi-only style because it generates quickly and I'm also guaranteed to see the notes being played on BIAB's keyboards. What I discovered was (which I'm sure you already know because I've read some of your past posts and I know that your level of theory exceeds mine) ...

C4 is, as you say, C-F-Bb (which is indeed a second inversion of Fsus)

Csus is C-F-G

C7sus is C-F-G-Bb

I must say, I like the C4 sound. I'm going to have to play around with that one. I only tried one style but at first glance, it looks like C4 is a quartal chord with a root of C. (It might be that I randomly chose a style that treats C4 in this way. More investigation is needed.)

Thank you for drawing my attention to it.

Regards,
Noel

MY SONGS...
Audiophile BIAB 2025