diff --git a/code/__DEFINES/sound.dm b/code/__DEFINES/sound.dm
index 6dc43fb959..620d8bed10 100644
--- a/code/__DEFINES/sound.dm
+++ b/code/__DEFINES/sound.dm
@@ -5,6 +5,9 @@
 #define CHANNEL_JUKEBOX 1021
 #define CHANNEL_JUSTICAR_ARK 1020
 #define CHANNEL_HEARTBEAT 1019 //sound channel for heartbeats
+#define CHANNEL_AMBIENCE 1018
+#define CHANNEL_BUZZ 1017
+#define CHANNEL_BICYCLE 1016
 
 //Citadel code
 #define CHANNEL_PRED 1018
@@ -12,5 +15,8 @@
 //THIS SHOULD ALWAYS BE THE LOWEST ONE!
 //KEEP IT UPDATED
 
-#define CHANNEL_HIGHEST_AVAILABLE 1017
+#define CHANNEL_HIGHEST_AVAILABLE 1015
 
+#define CHANNEL_HIGHEST_AVAILABLE 1017
+#define SOUND_MINIMUM_PRESSURE 10
+#define FALLOFF_SOUNDS 0.5