Hi,
Gimson writes that the glottal plosive is to be kept separate from any glottalisation or lanryngelisation involving creaky voicing or the vibration of the false vocal folds just above the vocal folds in the vocal tract. He goes on to mention that these latter sounds are often associated with extra low tones in intonation patterns; he also mentions that such sounds may be heard at almost any pitch level as far as certain 'affected' voice qualities are concerned.
What does Gimson mean by 'affected voice quality'? Do you know anyone who speaks with this kind of voice?