[1]: 328 An example of a doubly articulated consonant is the voiceless labial-velar stop [k͡p], which is pronounced simultaneously at the velum (a [k]) and at the lips (a [p]).
In practically all languages of the world that have doubly articulated consonants, these are either clicks or labial-velars.
An example of a consonant with secondary articulation is the voiceless labialized velar stop [kʷ] has only a single stop articulation, velar [k], with a simultaneous approximant-like rounding of the lips.
The most frequently encountered are labialization (such as [kʷ]), palatalization (such as the Russian "soft" consonants like [pʲ]), velarization (such as the English "dark" el [lˠ]), and pharyngealization (such as the Arabic emphatic consonants like [tˤ]).
The glottis controls phonation, and works simultaneously with many consonants.