fix

code/datums/soundOutput.dm

@@ -6,6 +6,7 @@
 	var/status_flags = 0 //For things like ear deafness, psychodelic effects, and other things that change how all sounds behave
 	var/list/echo
 	var/list/current_sounds = list()
+	var/list/source_sounds = list()
 
 /datum/soundOutput/New(client/C)
 	if(!C)
@@ -15,7 +16,7 @@
 	RegisterSignal(owner, COMSIG_MOVABLE_MOVED, PROC_REF(update_sounds))
 	. = ..()
 
-#define SMOOTHING 1 // How much smoothing when moving between tiles, smaller is more smoothing
+#define SMOOTHING 1 // How much smoothing when moving between tiles, smaller value means more smoothing
 
 /datum/soundOutput/proc/update_sounds(atom/user, direction)
 	SIGNAL_HANDLER
@@ -31,6 +32,22 @@
 					process_sound(current_sounds[channel], TRUE, -1+i/32)
 				if(8)
 					process_sound(current_sounds[channel], TRUE, 1-i/32, 0)
+
+/datum/soundOutput/proc/update_sounds_from_source(atom/source, direction)
+	SIGNAL_HANDLER
+	for(var/channel in source_sounds[source])
+		for(var/i in 0 to round(32/SMOOTHING))
+			i = i * SMOOTHING
+			switch(direction)
+				if(1)
+					process_sound(current_sounds[channel], TRUE, 0, 1+i/32)
+				if(2)
+					process_sound(current_sounds[channel], TRUE, 0, -1-i/32)
+				if(4)
+					process_sound(current_sounds[channel], TRUE, 1+i/32)
+				if(8)
+					process_sound(current_sounds[channel], TRUE, -1-i/32, 0)
+
 /datum/soundOutput/proc/remove_sound(channel)
 	current_sounds -= channel
 
@@ -46,12 +63,16 @@
 	S.status = update ? SOUND_UPDATE : T.status 
 	S.echo = T.echo
 	if(!update)
-		S.params = list("on-end" = ".soundend [S.channel]")
+		S.params = list("on-end" = ".soundend [S.channel] [T.source]")
 
 
 	var/turf/source_turf
 	if(!QDELETED(T.source))
 		source_turf = get_turf(T.source)
+
+		if(!update && istype(T.source, /atom/movable))
+			source_sounds[T.source] = T
+			RegisterSignal(T.source, COMSIG_MOVABLE_MOVED, PROC_REF(update_sounds))
 	else
 		source_turf = locate(T.x, T.y, T.z)
 
@@ -83,10 +104,14 @@
 		current_sounds[num2text(S.channel)] = T
 	sound_to(owner, S)
 
-/client/verb/sound_ended(channel as num)
+/client/verb/sound_ended(channel as num, source as atom)
 	set name = ".soundend"
 
 	soundOutput.remove_sound(num2text(channel))
+
+	if(soundOutput.source_sounds[source])
+		soundOutput.source_sounds -= source
+		UnregisterSignal(source, COMSIG_MOVABLE_MOVED)
 
 
 /datum/soundOutput/proc/update_ambience(area/target_area, ambience_override, force_update = FALSE)

code/modules/mob/living/carbon/xenomorph/abilities/runner/runner_powers.dm

@@ -126,7 +126,7 @@
 		multitile_vehicle.take_damage_type(20 / acid.acid_delay, "acid", src)
 		visible_message(SPAN_XENOWARNING("[src] vomits globs of vile stuff at [multitile_vehicle]. It sizzles under the bubbling mess of acid!"), \
 			SPAN_XENOWARNING("We vomit globs of vile stuff at [multitile_vehicle]. It sizzles under the bubbling mess of acid!"), null, 5)
-		playsound(O, "sound/bullets/acid_impact1.ogg", 25)
+		playsound(affected_atom, "sound/bullets/acid_impact1.ogg", 25)
 		QDEL_IN(acid, 20)
 		return
 
@@ -135,7 +135,7 @@
 
 	visible_message(SPAN_XENOWARNING("[src] vomits globs of vile stuff all over [affected_atom]. It begins to sizzle and melt under the bubbling mess of acid!"), \
 	SPAN_XENOWARNING("We vomit globs of vile stuff all over [affected_atom]. It begins to sizzle and melt under the bubbling mess of acid!"), null, 5)
-	playsound(O, "sound/bullets/acid_impact1.ogg", 25)
+	playsound(affected_atom, "sound/bullets/acid_impact1.ogg", 25)
 
 
 /datum/action/xeno_action/activable/acider_for_the_hive/use_ability(atom/affected_atom)