The only chord that I know of that has a flatted 9th with no seventh is the major sus4 flat9 chord; for example Csus4b9.

See here: https://en.wikibooks.org/wiki/Music_Theory/Complete_List_of_Chord_Patterns


I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware