Sounds: Edit some sound gains, mostly footsteps

I recently made glass footstep and dig gains too low, raise slightly.
Change dirt dug gain from above-maximum 1.5 to maximum 1.0.
Reduce gain of footsteps: stone, dirt, gravel, wood, metal
Raise gain of leaves footstep.

mods/default/functions.lua

@@ -18,7 +18,7 @@ end
 function default.node_sound_stone_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_hard_footstep", gain = 0.5}
+			{name = "default_hard_footstep", gain = 0.3}
 	table.dug = table.dug or
 			{name = "default_hard_footstep", gain = 1.0}
 	default.node_sound_defaults(table)
@@ -28,9 +28,9 @@ end
 function default.node_sound_dirt_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_dirt_footstep", gain = 1.0}
+			{name = "default_dirt_footstep", gain = 0.4}
 	table.dug = table.dug or
-			{name = "default_dirt_footstep", gain = 1.5}
+			{name = "default_dirt_footstep", gain = 1.0}
 	table.place = table.place or
 			{name = "default_place_node", gain = 1.0}
 	default.node_sound_defaults(table)
@@ -52,7 +52,7 @@ end
 function default.node_sound_gravel_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_gravel_footstep", gain = 0.5}
+			{name = "default_gravel_footstep", gain = 0.4}
 	table.dug = table.dug or
 			{name = "default_gravel_footstep", gain = 1.0}
 	table.place = table.place or
@@ -64,7 +64,7 @@ end
 function default.node_sound_wood_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_wood_footstep", gain = 0.5}
+			{name = "default_wood_footstep", gain = 0.3}
 	table.dug = table.dug or
 			{name = "default_wood_footstep", gain = 1.0}
 	default.node_sound_defaults(table)
@@ -74,7 +74,7 @@ end
 function default.node_sound_leaves_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_grass_footstep", gain = 0.35}
+			{name = "default_grass_footstep", gain = 0.45}
 	table.dug = table.dug or
 			{name = "default_grass_footstep", gain = 0.7}
 	table.dig = table.dig or
@@ -88,9 +88,9 @@ end
 function default.node_sound_glass_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_glass_footstep", gain = 0.25}
+			{name = "default_glass_footstep", gain = 0.3}
 	table.dig = table.dig or
-			{name = "default_glass_footstep", gain = 0.45}
+			{name = "default_glass_footstep", gain = 0.5}
 	table.dug = table.dug or
 			{name = "default_break_glass", gain = 1.0}
 	default.node_sound_defaults(table)
@@ -100,7 +100,7 @@ end
 function default.node_sound_metal_defaults(table)
 	table = table or {}
 	table.footstep = table.footstep or
-			{name = "default_metal_footstep", gain = 0.5}
+			{name = "default_metal_footstep", gain = 0.4}
 	table.dig = table.dig or
 			{name = "default_dig_metal", gain = 0.5}
 	table.dug = table.dug or