This patch removes the annoying audible-bell on emacs. Apply the homebrew patch and install with `brew install emacs --HEAD --use-git-head`

homebrew.patch

From 604821b954478b1b10725de9f625682e97080b01 Mon Sep 17 00:00:00 2001
From: Sathyanarayanan Gunasekaran <gsathya.ceg@gmail.com>
Date: Tue, 29 Jul 2014 17:26:51 -0700
Subject: [PATCH 1/1] Add patch to disable Emacs audible bell on osx

---
 Library/Formula/emacs.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Library/Formula/emacs.rb b/Library/Formula/emacs.rb
index 385eead..ad2f886 100644
--- a/Library/Formula/emacs.rb
+++ b/Library/Formula/emacs.rb
@@ -24,6 +24,11 @@ class Emacs < Formula
 
     depends_on :autoconf
     depends_on :automake
+
+    patch do
+      url "https://gist.githubusercontent.com/gsathya/ed9108a05dee6f1d639b/raw/64f011b5ca75f18acbae024c93225990e357b7b0/remove_audible_bell.patch"
+      sha1 "d478ec9f7e5182da861852db1b483e3c5f13e39c"
+    end
   end
 
   stable do
-- 
1.9.3

remove_audible_bell.patch

From 605b88b9791a9e72595e1624a951a8c5e828cd37 Mon Sep 17 00:00:00 2001
From: Sathyanarayanan Gunasekaran <gsathya.ceg@gmail.com>
Date: Tue, 29 Jul 2014 17:15:35 -0700
Subject: [PATCH 1/1] No audible bell on OSX

---
 src/nsterm.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index 47ad28a..5749b81 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -1033,7 +1033,7 @@ ns_ring_bell (struct frame *f)
     }
   else
     {
-      NSBeep ();
+      // NSBeep ();
     }
 }
 
-- 
1.9.3