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Hi Alan,

When you said ...
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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)
....
Noel



That certainly looks to me like the C4 IS a C quartal chord. Thanks guys.

Ian