File Frame captura correctamente el fichero del modal y borra en caso de eliminarlo

js/soundmap.add.js

@@ -52,6 +52,16 @@
                 this.marker.addEventListener('dragend', this.markerDrag, this);
             }
             //_.bindAll(this);
+						//init elements 
+						this.file_frame = wp.media({
+           	 		multiple: false,
+            		library: {
+                	type: 'audio'
+            		}
+        		});
+						console.log(this.file_frame)
+								console.log('iniciando file_frame')
+
             this.initEvents();
 ;
 
@@ -60,7 +70,7 @@
 
         initEvents: function(){
             $('#add_files').bind('click', this.openMediaManager);
-            this.file_frame.on('select',this.mediaSelected, this);
+            wp.media.frames.file_frame.on('select',this.mediaSelected, this);
             $('.delete-att-item').live('click', this.removeMedia);
         },
 
@@ -68,13 +78,15 @@
             $(event.currentTarget).parents('.soundmap-attach-item').remove();
         },
         openMediaManager: function(event){
+						this.file_frame = wp.media.frames.file_frame
             event.preventDefault();
             if ( this.file_frame ){
                 this.file_frame.open();
                 return;
-            };
+						}
         },
         mediaSelected: function(event){
+						this.file_frame = wp.media.frames.file_frame
             var attachment = this.file_frame.state().get('selection').first().toJSON();
             var _cT = _.template(this.attachTemplate);
             var _o = _cT({