dsp.AudioPlayer : output audio buffer clear

I am using dsp.AudioPlayer( ) for real-time playing audio files.

The problem is that very short noise is generated at the beginning of the play. I think this is caused by garbage data that remains in the audio buffer at the last play.

When running my code after executing 'clear all', short noise is not generated. How can I clear real-time output buffers used in dsp.AudioPlayer( )?

My matlab version is 2013b.