The third multiphonic in the randomly selected list is the first I’m to document that is not an artifact of Jeffrey Ryan’s Arbutus.
Happily, this multiphonic is quick to respond and powerful making it a real rip-snorter when played with gusto. Yet it can also be played quite softly if you have a fluency for that sort of thing.

Make note that without the low B key depressed, this merely plays a handsomely in-tune Eb over the break (that’s a post for another time). The combination of the open left hand first finger and the low B key are the active ingredients in making this baby work.
I also mucked about with lowering the first finger left hand to — among other things — sound the low Eb, but also to find all sorts of delightful little micro-multiphonics (you heard it here first) that reside in the twilight world of sounds between everyday notes.
The recording I made is just the straight up in-your-face multiphonic, but I may get around to documenting some of the other nifty sounds possible (if I can figure out how to notate them). Enjoy.