format  void PCM_EntryNext (PcmHn pcm)
 Input  pcm: Handle
 Output  None
 Function value  None
 Function  Register the handle to be played next.
 Remarks  If a handle is registered with this function, it will be automatically executed when the currently played handle ends.
 The playback of the next handle will start . If NULL is specified, registration will be canceled.
:  Handles registered with this function will start playing even when forcibly switching with PCM_Change.
 .
  Only one handle can be registered. Not registered when switching to the registered handle
 becomes , and the next handle can be registered. 

  format  void PCM_Change (void)
 Input  None
 Output  None
 Function value  None
 Function  The handle currently being played is interrupted, and the handle registered with PCM_EntryNext
 Raw  Starts raw. 

  format  PcmChangeStatus PCM_CheckChange (void)
 Input  None
 Output  None
 Function value  Forced switchability check value
 Function  Returns the possibility of switching when performing forced switching with PCM_Change.