Accidentally deleted Danny's original message, so I'm replying here.

Quoting Nik Taylor <[log in to unmask]>:

> Danny Wier wrote:
> > We had a native
> > Korean speaker on the list years ago, and I can't remember her name
> Yoon Ha Lee.
> > but she
> > said something about these being pronounced with glottal tension but not
> > ejectivity, and that these consonants may also be voiced. These consonants
> > do correspond to Middle Chinese voiced aspirates, by the way.

IIRC, YHL described the distinction as tense vs lenis. Time to do some archive
searching, when I can marshall the energy (I'm right back from Munich, and
pretty tired).