On Windows and on the Mac, in normal quality mode (AkSoundQuality::AkSoundQuality_High), the audio frame size is 1024 samples at 48 KHz, which corresponds to about 21.3 milliseconds. In reduced quality mode (AkSoundQuality::AkSoundQuality_Low), the audio frame size is 1024 samples at 24 KHz, which corresponds to about 42.6 milliseconds.