diff --git a/code/__DEFINES/sounds.dm b/code/__DEFINES/sounds.dm
index 498e68486d..079d5c9258 100644
--- a/code/__DEFINES/sounds.dm
+++ b/code/__DEFINES/sounds.dm
@@ -32,6 +32,27 @@
 #define SOUND_CHANNEL_LOBBY 1023
 #define SOUND_CHANNEL_Z 1024
 
+//default byond sound echo list index positions.
+//ECHO_DIRECT and ECHO_ROOM are the only two that actually appear to do anything, and represent the dry and wet channels of the environment effects, respectively.
+#define ECHO_DIRECT 1
+#define ECHO_DIRECTHF 2
+#define ECHO_ROOM 3
+#define ECHO_ROOMHF 4
+#define ECHO_OBSTRUCTION 5
+#define ECHO_OBSTRUCTIONLFRATIO 6
+#define ECHO_OCCLUSION 7
+#define ECHO_OCCLUSIONLFRATIO 8
+#define ECHO_OCCLUSIONROOMRATIO 9
+#define ECHO_OCCLUSIONDIRECTRATIO 10
+#define ECHO_EXCLUSION 11
+#define ECHO_EXCLUSIONLFRATIO 12
+#define ECHO_OUTSIDEVOLUMEHF 13
+#define ECHO_DOPPLERFACTOR 14
+#define ECHO_ROLLOFFFACTOR 15
+#define ECHO_ROOMROLLOFFFACTOR 16
+#define ECHO_AIRABSORPTIONFACTOR 17
+#define ECHO_FLAGS 18
+
 //default byond sound environments
 #define SOUND_ENVIRONMENT_NONE -1
 #define SOUND_ENVIRONMENT_GENERIC 0
diff --git a/code/game/sound.dm b/code/game/sound.dm
index 486409f097..fcbdd7f283 100644
--- a/code/game/sound.dm
+++ b/code/game/sound.dm
@@ -155,7 +155,7 @@
  *
  * Returns selected channel on success, FALSE on failure
  */
-/proc/playsound(atom/source, sound/soundin, vol = 100, vary, sound_range, vol_cat = VOLUME_SFX, channel, status, falloff = 1)
+/proc/playsound(atom/source, sound/soundin, vol = 100, vary, sound_range, vol_cat = VOLUME_SFX, channel, status, falloff = 1, list/echo)
 	if(!get_turf(source))
 		error("[source] has no turf and is trying to play a spatial sound: [soundin]")
 		return FALSE
@@ -188,7 +188,7 @@
 	return template.channel
 
 //This is the replacement for playsound_local. Use this for sending sounds directly to a client
-/proc/playsound_client(client/client, sound/soundin, atom/origin, vol = 100, random_freq, vol_cat = VOLUME_SFX, channel, status)
+/proc/playsound_client(client/client, sound/soundin, atom/origin, vol = 100, random_freq, vol_cat = VOLUME_SFX, channel, status, list/echo)
 	if(!istype(client))
 		error("[client] is not a client and is trying to play a client sound: [soundin]")
 		return FALSE
@@ -247,7 +247,7 @@
 
 
 /// Play sound for all on-map clients on a list of z-levels. Good for ambient sounds.
-/proc/playsound_z(list/z_values, sound/soundin, volume = 100, vol_cat = VOLUME_SFX)
+/proc/playsound_z(list/z_values, sound/soundin, volume = 100, vol_cat = VOLUME_SFX, list/echo)
 	var/datum/sound_template/template = new(soundin)
 
 	template.channel = SOUND_CHANNEL_Z