[ConnorMcLeod]

For #6 errors/warnings, you can only replace knife sounds with GHW_Weapon_Replacement.amxx, but i guess this error can also occur client side if you use "personal" custom weapons skins.

Also i'm not sure that disable multilingual.amxx is a good idea, but let other people say more about this.

Could you give a link to this plugin : AdvancedMusicPlayer.amxx ?

Hope it will help you ;)