The "Schedule Next Play" audio function appears to only work with audio files imported as sound, not music.
Steps to reproduce
1. In a new project, import an audio file as music.
2. Automate it to play it after a second or so with "schedule next play".
Upon running the project, the audio file plays immediately. "Schedule next play" seems to have no effect.
There should be a scheduled pause, as is the case when a sound file is used instead.
R266, Windows 10, tested on Chrome, NW, and Firefox.
As an aside, I'm using this to seamlessly flow an "intro" music track into a "loop" track (because "on audio end" leaves a small pause). It works fantastically... aside from this minor problem of having to import all my music as sound.