Shifted sounds with preloadComplex IOS 9+

[Faksprod]

I'm trying to play 7 sounds of 8 seconds at the same time. The timing has to be perfect. If I use "preloadSimple" (which use a lower-level native APIs) it works well. Sounds starts exactly at the same time.

But I'm forced to use "preloadComplex" to set more options (volume, stop, etc.).

If I use "preloadComplex" (which use a higher-level APIs I suppose) sounds are very shifted... Any idea ? I have already tried the official "cordova-plugin-media" to manage sounds but it's even worst.