This is the 15057th most frequent Turkish word.
seslerini
"Their sounds" or "the sounds of them."
"Seslerini" (their sounds) is used as the object of the verb "duyuruyor" (let be heard).
Kuşlar sabahları seslerini duyuruyor.
The birds let their sounds be heard in the mornings.
"Seslerini" (their voices) is the object of the verb "yükseltti" (raised).
Çocuklar oyun oynarken seslerini yükseltti.
The children raised their voices while playing.
"Seslerini" (their sounds) is used as the possessive object involved in the action of "kaydederek" (by recording).