The megaphone MOD module also has a TTS filter, just like the OG megaphone (#92967)

## About The Pull Request
Better be consistent.

## Why It's Good For The Game
Consistency.

## Changelog

🆑
fix: The megaphone MOD module also has a TTS filter when active, just
like the handheld version.
/🆑

code/modules/mod/modules/modules_security.dm

@@ -165,9 +165,10 @@
 
 /obj/item/mod/module/megaphone/on_activation(mob/activator)
 	RegisterSignal(mod.wearer, COMSIG_MOB_SAY, PROC_REF(handle_speech))
+	RegisterSignal(mod.wearer, COMSIG_LIVING_TREAT_MESSAGE, PROC_REF(add_tts_filter))
 
 /obj/item/mod/module/megaphone/on_deactivation(mob/activator, display_message = TRUE, deleting = FALSE)
-	UnregisterSignal(mod.wearer, COMSIG_MOB_SAY)
+	UnregisterSignal(mod.wearer, list(COMSIG_LIVING_TREAT_MESSAGE, COMSIG_MOB_SAY))
 
 /obj/item/mod/module/megaphone/proc/handle_speech(datum/source, list/speech_args)
 	SIGNAL_HANDLER
@@ -175,6 +176,11 @@
 	speech_args[SPEECH_SPANS] |= voicespan
 	drain_power(use_energy_cost)
 
+/obj/item/mod/module/megaphone/proc/add_tts_filter(mob/living/carbon/user, list/message_args)
+	SIGNAL_HANDLER
+	///A sharper and louder sound with a bit of echo
+	message_args[TREAT_TTS_FILTER_ARG] += "acrusher=samples=2:level_out=6,aecho=delays=90:decays=0.3,aemphasis=type=cd,acontrast=30,crystalizer=i=5"
+
 ///Criminal Capture - Generates hardlight bags you can put people in and sinch.
 /obj/item/mod/module/criminalcapture
 	name = "MOD criminal capture module"