Great IPA site with sound samples. No voiced glottal plosives though, which is what I was looking for!
An interesting reference under the description for the “labiodental nasal” ( ɱ ):
There does exist an oral counterpart to this sound, but it is very rare and the IPA does not even include it in its tables. (And we won’t include it either.)
I wonder what that would be!
Web link of note: UNIL introduction to phonetics