I don't understand why no option like this in the audio plugin, if i had 40 sounds in my game it's better to preload all sounds when the player watching the loge or on the menu screen...
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There is a preload option in the audio object however you need to read https://www.scirra.com/manual/109/audio
I know about the preload option, but it take a single sound not all sounds.
The thing is mostly I think you should preload them not all at once, only the needed ones firt, then the others
Audio when un packed uses a noticible amount of memory. What is 3mb in a file may end up using 20mb+ in memory. This is innefecient and poor design to include 10 unique sound files that are only used on one layout for 2% of the game, yet is loaded for 98% of the game play.
it's best to to hold up the load per layout and load the sound files used in that layout.