^ 90 sounds!? ouch, if this doesn't work then that may be your last resort:
~ For each sound in your library, right-click it and select 'Linkage...' and check the box that says "Export for Actionscript", then enter into the "Identifier" text box (for example) "sound1", then put the following code onto the frame before your preloader:
var snd1:Sound = new Sound(this);
snd1.attachSound("sound1", true);
Change sound1 in the code to w/e you put in the Indentifier.
You will have to do this for every sound unfortunately, I find layers to be the quickest way D:.
Either way, hope this works out, SAVE A BACKUP incase for some reason it screws up >_<!