format  Bool STM_SetLoop (StmGrpHn grp, StmHn loopstm, Sint32 loopmax)
 Input  grp: Stream group handle
:  loopstm: Loop start stream
:  (NULL if not looping; STM_LOOP_DFL for the first stream)
:  loopmax: Number of loops (STM_LOOP_ENDLESS if infinite)
 Output  None
 Function value  TRUE: When set correctly
  FALSE: Resident stream
 Function  Specify the loop start stream and loop count of the stream group.
 Remarks  (a) The default loop start stream is the most forward stream. Loop times
  Infinite times.
:  (b) When the loop start stream is closed, the first stream is the loop open.
  Start stream.
  (c) Loop counter is initialized.
  (d) A resident stream cannot be specified as a loop start stream. 

  format  Sint32 STM_GetLoopCnt (StmGrpHn grp)
 Input  grp: Stream group handle
 Output  None
 Function value  Loop counter
 Function  Get the number of loops. 

  format  Sint32 STM_GetExecStat (StmGrpHn grp, Sint32 * fad)
 Input  grp: Stream group handle
 Output  fad: FAD being played
 Function value  Stream access status (StmAcStat)
 Function  Gets the execution status of the specified stream group.