Editing Fortis and lenis (section)

==== Subglottal pressure ====
It is rare for the use of greater ''respiratory'' energy for [[segment (linguistics)|segments]] to occur in a language, though some examples do exist, such as [[Korean language|Korean]], which makes a three way contrast amongst most of its obstruents with voiceless, [[aspirated consonant|aspirated]], and a third [[faucalized voice]]d set that involves both an increase in subglottal pressure as well as greater glottal constriction and tenseness in the walls of the vocal tract.<ref>{{Harvcoltxt|Ladefoged|Maddieson|1996|p=95}}</ref>  [[Igbo language|Igbo]] has also been observed to utilize an increase in subglottal pressure involving its aspirated consonants.<ref>{{Harvcoltxt|Ladefoged|Maddieson|1996|p=95}}</ref>