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Firstly I want to ask you about your enviromental sounds and how in depth you are taking them will there be approptiate sounds for every enviroment with babbling brooks, quiet whispers in libraries, busy haggling and shouts from the crowd in the market places etc. ?
Secondly I want to ask about npc's and their one greatest flaw in all mmos to date in the area of sound, no voices they are all voiceless mutes who all have text but no actual voices. The only exception are the really important characters and they are far and few between. It's not that I'm expecting a full cgi movie every time I talk to a npc ( though that would be freaking sweet) no I just want to actually hear someone's voice when I'm talking to someone in the game that isn't a player.
Let us move on to my third worry / rant material music. Music is the proverbial icing on the cake and as such it can create emotional reactions that can make us weep with joy, pray in terror, and stand in awe but most mmo's (and most games in general) don't give it as much attention as it deserves they just stick the standard orchestra music and call it a day. What they should be doing is useing the music to create a certain feeling while in a certain area of the game, an example of this done well would be silent hill where the music feels genuinly creepy which is of course the point of the game. to make it simple the music should draw attention to itself in a way that doesn't break the immersive quality of the game but deepens it to perfect harmony between excellent music, graphics, and gameplay that seemlessly blend together to create a superior gaming experiance.
Finally on a note completely different from the above will your game have some steampunk influences expecially in areas like Morphael’s fortress and other areas where technology or in a common cases in fantasy settings magiology where magic is used to run what can be obviously seen as our technology with a magic power source or reasoning behind it.