Actionscript 3 :: Embed Dynamic Audio File(s) / Use Variables In Embed?

Making a piano/keyboard application and trying to figure out the best way to set this up .I plan on having a directory of sounds for each 'instrument' in my assets folder (piano1/C4.mp3,piano1/D4.mpg,...)Is there a way to import/embed all of these as an array? Also is there a way I can pass a variable to this class to indicate which folder I want to import these from? Something that would be ideal

var type = "piano2"; //passed from class being called by
foreach(notes as note){
[Embed(source = 'assets/sounds/'+type +'/'+note+'.mp3')] private const C3:Class;
public var c3:Sfx = new Sfx(C3);
}

Or would it be a better idea to have a class for each of these "types" that pulls all notes?