diff --git a/ballance_blender_plugin/UTILS_icons_manager.py b/ballance_blender_plugin/UTILS_icons_manager.py
index 3d5c500..8c4681a 100644
--- a/ballance_blender_plugin/UTILS_icons_manager.py
+++ b/ballance_blender_plugin/UTILS_icons_manager.py
@@ -7,62 +7,91 @@ blender_info_icon = 'INFO'
 blender_warning_icon = 'ERROR'
 blender_error_icon = 'CANCEL'
 
-# ImagePreviewCollection ccreated by Blender
-floor_icons = None
+# universal icon loader, all icon are stored in this preview collection
+universal_icons = None
+
+# empty icon for placeholder
+empty_icon_id = 0
+
 # a map. key is block name, value is loaded icon id
 floor_icons_map: dict = {}
-
-element_icons = None
 element_icons_map: dict = {}
+groupext_icons_map: dict = {}
 
-group_map_to_element: dict = {
+group_name_conv_map: dict = {
     "PS_Levelstart": "PS_FourFlames",
     "PE_Levelende": "PE_Balloon",
     "PC_Checkpoints": "PC_TwoFlames",
-    "PR_Resetpoints": "PR_Resetpoint"
+    "PR_Resetpoints": "PR_Resetpoint",
+
+    "Sound_HitID_01": "SoundID_01",
+    "Sound_RollID_01": "SoundID_01",
+    "Sound_HitID_02": "SoundID_02",
+    "Sound_RollID_02": "SoundID_02",
+    "Sound_HitID_03": "SoundID_03",
+    "Sound_RollID_03": "SoundID_03"
 }
 
 def register_icons():
-    global floor_icons, floor_icons_map
-    global element_icons, element_icons_map
+    global universal_icons
+    global empty_icon_id
+    global floor_icons_map, element_icons_map, groupext_icons_map
 
+    # create preview collection and get icon folder
     icon_path = os.path.join(os.path.dirname(__file__), "icons")
+    universal_icons = bpy.utils.previews.new()
 
-    floor_icons = bpy.utils.previews.new()
+    # load empty
+    universal_icons.load("BlcBldPlg_EmptyIcon", os.path.join(icon_path, "Empty.png"), 'IMAGE')
+    empty_icon_id = universal_icons["BlcBldPlg_EmptyIcon"].icon_id
+
+    # add floor icon
     for key, value in UTILS_constants.floor_blockDict.items():
         blockIconName = "BlcBldPlg_FloorIcon_" + key
-        floor_icons.load(blockIconName, os.path.join(icon_path, "floor", value["BindingDisplayTexture"]), 'IMAGE')
-        floor_icons_map[key] = floor_icons[blockIconName].icon_id
+        universal_icons.load(blockIconName, os.path.join(icon_path, "floor", value["BindingDisplayTexture"]), 'IMAGE')
+        floor_icons_map[key] = universal_icons[blockIconName].icon_id
 
-    element_icons = bpy.utils.previews.new()
+    # add elements icon
     for elename in UTILS_constants.bmfile_componentList:
         blockIconName = "BlcBldPlg_ElementIcon_" + elename
-        element_icons.load(blockIconName, os.path.join(icon_path, "element", elename + '.png'), 'IMAGE')
-        element_icons_map[elename] = element_icons[blockIconName].icon_id
+        universal_icons.load(blockIconName, os.path.join(icon_path, "element", elename + '.png'), 'IMAGE')
+        element_icons_map[elename] = universal_icons[blockIconName].icon_id
+
+    # add extra group icon
+    for grp in ("SoundID_01", "SoundID_02", "SoundID_03"):
+        blockIconName = "BlcBldPlg_GroupIcon_" + grp
+        universal_icons.load(blockIconName, os.path.join(icon_path, "group", grp + '.png'), 'IMAGE')
+        groupext_icons_map[grp] = universal_icons[blockIconName].icon_id
 
 def unregister_icons():
-    global floor_icons, floor_icons_map
-    global element_icons, element_icons_map
+    global universal_icons
+    global floor_icons_map, element_icons_map, groupext_icons_map
 
-    bpy.utils.previews.remove(floor_icons)
+    bpy.utils.previews.remove(universal_icons)
     floor_icons_map.clear()
-    bpy.utils.previews.remove(element_icons)
     element_icons_map.clear()
+    groupext_icons_map.clear()
 
 def get_floor_icon(floor_blk_name: str):
-    global floor_icons_map
-    # default return 0
-    return floor_icons_map.get(floor_blk_name, 0)
+    # default return empty icon
+    return floor_icons_map.get(floor_blk_name, empty_icon_id)
 
 def get_element_icon(element_name: str):
-    global element_icons_map
-    # default return 0
-    return element_icons_map.get(element_name, 0)
+    # default return empty icon
+    return element_icons_map.get(element_name, empty_icon_id)
 
 def get_group_icon(group_name: str):
     # try parse string
     # if not found, return self
-    return get_element_icon(group_map_to_element.get(group_name, group_name))
+    conv_name = group_name_conv_map.get(group_name, group_name)
+
+    # get from extra group icon first
+    idx = groupext_icons_map.get(conv_name, empty_icon_id)
+    if idx != empty_icon_id:
+        return idx
+
+    # if failed, get from element. if still failed, return empty icon
+    return get_element_icon(conv_name)
 
 # no matter how, register icon always
 # and no unregister call
diff --git a/ballance_blender_plugin/icons/Empty.png b/ballance_blender_plugin/icons/Empty.png
new file mode 100644
index 0000000..285ac30
Binary files /dev/null and b/ballance_blender_plugin/icons/Empty.png differ
diff --git a/ballance_blender_plugin/icons/group/SoundID_01.png b/ballance_blender_plugin/icons/group/SoundID_01.png
new file mode 100644
index 0000000..e81c7fb
Binary files /dev/null and b/ballance_blender_plugin/icons/group/SoundID_01.png differ
diff --git a/ballance_blender_plugin/icons/group/SoundID_02.png b/ballance_blender_plugin/icons/group/SoundID_02.png
new file mode 100644
index 0000000..3079b7d
Binary files /dev/null and b/ballance_blender_plugin/icons/group/SoundID_02.png differ
diff --git a/ballance_blender_plugin/icons/group/SoundID_03.png b/ballance_blender_plugin/icons/group/SoundID_03.png
new file mode 100644
index 0000000..bd2f4bf
Binary files /dev/null and b/ballance_blender_plugin/icons/group/SoundID_03.png differ