To keep things organized, I would suggest reading my post more thoroughly. 
In this post I am talking about Waveform Audio Player. In the other post (where you responded about Waveform Audio Player) I am talking about Advanced Audio Player (a second audio player plugin you have).
And about the steps you recommended in the other thread about the Waveform player, did you try it yourself? It doesn’t work at all, as you suggested. Problems:
- Loading the initial track works, but adding two additional tracks only adds one. (Tracks to be played next = 1)
- “Next track” starts autoplaying the next track, even though I haven’t pressed play
- When I load in the same playlist again, now it loads all three tracks. (However it also autoplays the first track.)
- Even though it shows three tracks are loaded, when I go to second track with next and then go back to first track, it now loads in third track instead.
Though about maybe timing issues, so I tried using “Wavefrom player has loaded” event to trigger adding to playlists after that event. But that event never fires. So I cannot confirm about the timing issues.