Adaptive media playout techniques are used to avoid buffer underflow in a dynamic streaming environment where the
available bandwidth may be fluctuating. In this paper we report human perceptions from audio quality studies that we
performed on speech and music samples for adaptive audio playout. Test methods based on ITU-R BS. 1534-1
recommendation were used. Studies were conducted for both slow playout and fast playout. Two scales - a coarse scale
and a finer scale was used for the slow and fast audio playout factors. Results from our study can be used to determine
acceptable slow and fast playout factors for speech and music content. An adaptive media playout algorithm could use
knowledge of these upper and lower bounds on playback speeds to decide its adaptive playback schedule.