I’ve only checked OpenAL on Android and works great! Setting the start time to play a sound might be very useful, but I think a bit tricky, if even possible. Maybe someone have an idea, though?
The audio features of Defold are very basic and some really basic things are missing. We’re setting the roadmap for the next 6 to 12 months and some improvements to the audio system will be included. The things that have historically been asked for many many times are:
Ability to pitch sounds
Getting a message/callback when a sound has finished playing