an effect keeps playing is an xl3 concept, xl4 will not need this.
xl3 only had start timng
xl4 has start and ending timing.
sample snippet from new xml file from XL4
<ElementEffects>
<Element type='model' name = "Whole House">
<Effect id="1" Protected="0" startTime=" 0.000" endTime=" 0.100">Off,Off,Effect 1,IT_CHECKBOX_LayerMorph=0, ... </Effect>
<Effect id="2" Protected="0" startTime=" 0.100" endTime=" 0.262">Bars,None,Effect 1,IT_CHECKBOX_LayerMorph=0, ... </Effect>
We no longer need "None,None". We no longer need blank cells to mean keep on playing.
In XL3 we had all timing marks from all models merged together.
in XL4, if a model is on 3 times during your sequence, it will just have 3 rows of effects, each with a start and end time.
in XL4 you can have unlimited timing tracks. Manual, audacit bars, beats, note onsets, make your own percussion, trumpet, vocal tracks. When you select one effects that are dragged and drop will use those timing marks to set start and end time.