diff --git a/code/game/machinery/vending.dm b/code/game/machinery/vending.dm
index 61dfe3d915e..acbb6ff54cc 100644
--- a/code/game/machinery/vending.dm
+++ b/code/game/machinery/vending.dm
@@ -1,9 +1,14 @@
+#define CAT_NORMAL 0
+#define CAT_HIDDEN 1
+#define CAT_COIN   2
+
 /datum/data/vending_product
 	var/product_name = "generic"
 	var/product_path = null
 	var/amount = 0
 	var/price = 0
 	var/display_color = "blue"
+	var/category = CAT_NORMAL
 
 
 
@@ -119,10 +124,13 @@
 		R.display_color = pick("red","blue","green")
 
 		if(hidden)
+			R.category=CAT_HIDDEN
 			hidden_records += R
 		else if(req_coin)
+			R.category=CAT_COIN
 			coin_records += R
 		else
+			R.category=CAT_NORMAL
 			product_records += R
 
 		if(delay_product_spawn)
@@ -259,6 +267,31 @@
 /obj/machinery/vending/attack_ai(mob/user as mob)
 	return attack_hand(user)
 
+/obj/machinery/vending/proc/GetProductIndex(var/datum/data/vending_product/P)
+	var/list/plist
+	switch(P.category)
+		if(CAT_NORMAL)
+			plist=product_records
+		if(CAT_HIDDEN)
+			plist=hidden_records
+		if(CAT_COIN)
+			plist=coin_records
+		else
+			warning("UNKNOWN CATEGORY [P.category] IN TYPE [P.product_path] INSIDE [type]!")
+	return plist.Find(P)
+
+/obj/machinery/vending/proc/GetProductByID(var/pid, var/category)
+	switch(category)
+		if(CAT_NORMAL)
+			return product_records[pid]
+		if(CAT_HIDDEN)
+			return hidden_records[pid]
+		if(CAT_COIN)
+			return coin_records[pid]
+		else
+			warning("UNKNOWN PRODUCT: PID: [pid], CAT: [category] INSIDE [type]!")
+			return null
+
 /obj/machinery/vending/attack_hand(mob/user as mob)
 	if(stat & (BROKEN|NOPOWER))
 		return
@@ -291,12 +324,11 @@
 		dat += "<font color = 'red'>No product loaded!</font>"
 	else
 		var/list/display_records = src.product_records
+
 		if(src.extended_inventory)
-			display_records = src.product_records + src.hidden_records
+			display_records += src.hidden_records
 		if(src.coin)
-			display_records = src.product_records + src.coin_records
-		if(src.coin && src.extended_inventory)
-			display_records = src.product_records + src.hidden_records + src.coin_records
+			display_records += src.coin_records
 
 		for (var/datum/data/vending_product/R in display_records)
 			dat += "<FONT color = '[R.display_color]'><B>[R.product_name]</B>:"
@@ -304,7 +336,8 @@
 			if(R.price)
 				dat += " <b>(Price: [R.price])</b>"
 			if (R.amount > 0)
-				dat += " <a href='byond://?src=\ref[src];vend=\ref[R]'>(Vend)</A>"
+				var/idx=GetProductIndex(R)
+				dat += " <a href='byond://?src=\ref[src];vend=[idx];cat=[R.category]'>(Vend)</A>"
 			else
 				dat += " <font color = 'red'>SOLD OUT</font>"
 			dat += "<br>"
@@ -388,7 +421,10 @@
 				flick(src.icon_deny,src)
 				return
 
-			var/datum/data/vending_product/R = locate(href_list["vend"])
+			var/idx=text2num(href_list["vend"])
+			var/cat=text2num(href_list["cat"])
+
+			var/datum/data/vending_product/R = GetProductByID(idx,cat)
 			if (!R || !istype(R) || !R.product_path || R.amount <= 0)
 				return
 
diff --git a/code/game/sound.dm b/code/game/sound.dm
index 25e693a91c2..b5a4006e345 100644
--- a/code/game/sound.dm
+++ b/code/game/sound.dm
@@ -31,17 +31,7 @@ var/list/page_sound = list('sound/effects/pageturn1.ogg', 'sound/effects/pagetur
 			var/turf/T = get_turf(M)
 
 			if(T && T.z == turf_source.z)
-				//check that the air can transmit sound
-				var/datum/gas_mixture/environment = T.return_air()
-				if (!environment || environment.return_pressure() < SOUND_MINIMUM_PRESSURE)
-					if (distance > 1)
-						continue
-
-					var/new_frequency = 32000 + (frequency - 32000)*0.125	//lower the frequency. very rudimentary
-					var/new_volume = vol*0.15								//muffle the sound, like we're hearing through contact
-					M.playsound_local(turf_source, soundin, new_volume, vary, new_frequency, falloff, is_global)
-				else
-					M.playsound_local(turf_source, soundin, vol, vary, frequency, falloff, is_global)
+				M.playsound_local(turf_source, soundin, vol, vary, frequency, falloff, is_global)
 
 var/const/FALLOFF_SOUNDS = 0.5
 
@@ -63,12 +53,34 @@ var/const/FALLOFF_SOUNDS = 0.5
 	if(isturf(turf_source))
 		// 3D sounds, the technology is here!
 		var/turf/T = get_turf(src)
-		S.volume -= get_dist(T, turf_source) * 2 //multiplicative falloff to add on top of natural audio falloff.
-		var/datum/gas_mixture/environment = T.return_air()
-		if(get_dist(T, turf_source) > 2)
-			S.volume -= environment.return_pressure()/100 + 1
-		if (S.volume < 0)
-			S.volume = 0
+		
+		//sound volume falloff with distance
+		var/distance = get_dist(T, turf_source)
+		
+		S.volume -= max(distance - world.view, 0) * 2 //multiplicative falloff to add on top of natural audio falloff.
+		
+		//sound volume falloff with pressure
+		var/pressure_factor = 1.0
+		
+		var/datum/gas_mixture/hearer_env = T.return_air()
+		var/datum/gas_mixture/source_env = turf_source.return_air()
+		
+		if (hearer_env && source_env)
+			var/pressure = min(hearer_env.return_pressure(), source_env.return_pressure())
+			
+			if (pressure < ONE_ATMOSPHERE)
+				pressure_factor = max((pressure - SOUND_MINIMUM_PRESSURE)/(ONE_ATMOSPHERE - SOUND_MINIMUM_PRESSURE), 0)
+		else //in space
+			pressure_factor = 0
+		
+		if (distance <= 1)
+			pressure_factor = max(pressure_factor, 0.15)	//hearing through contact
+		
+		S.volume *= pressure_factor
+		
+		if (S.volume <= 0)
+			return	//no volume means no sound
+		
 		var/dx = turf_source.x - T.x // Hearing from the right/left
 		S.x = dx
 		var/dz = turf_source.y - T.y // Hearing from infront/behind