diff --git a/pgfw/Audio.py b/pgfw/Audio.py
index d280957..3e8df6b 100644
--- a/pgfw/Audio.py
+++ b/pgfw/Audio.py
@@ -232,7 +232,8 @@ class AudioPanel(Animation):
 
     def respond(self, event):
         if self.get_delegate().compare(event, "toggle-audio-panel") and \
-           pygame.key.get_mods() & KMOD_CTRL and pygame.key.get_mods() & KMOD_SHIFT:
+           pygame.key.get_mods() & KMOD_CTRL and pygame.key.get_mods() & KMOD_SHIFT and \
+           self.get_audio().sfx:
             if self.active:
                 self.deactivate()
             else:
diff --git a/pgfw/Vector.py b/pgfw/Vector.py
index 8ba476f..d98ce62 100644
--- a/pgfw/Vector.py
+++ b/pgfw/Vector.py
@@ -60,13 +60,13 @@ class Vector(list):
 
     def __eq__(self, other):
         for sv, ov in zip(self, other):
-            if value != other[ii]:
+            if sv != ov:
                 return False
         return True
 
     def __ne__(self, other):
         for sv, ov in zip(self, other):
-            if value == other[ii]:
+            if sv == ov:
                 return False
         return True
 
@@ -128,8 +128,8 @@ class EVector(Vector):
             else:
                 from .extension import get_angle, get_distance
                 end = self.x + dx, self.y + dy
+                self.angle = get_angle(self, end, True)
                 self.magnitude = get_distance(self, end)
-                self.angle = -get_angle(self, end) - pi
 
     def __repr__(self):
         return "<dx=%.2f, dy=%.2f, m=%.2f, ang=%.2f>" % \
diff --git a/pgfw/extension.py b/pgfw/extension.py
index 1b0c2f8..6b20354 100644
--- a/pgfw/extension.py
+++ b/pgfw/extension.py
@@ -35,7 +35,8 @@ def get_points_on_line(start, end, count):
     return points
 
 def get_angle(start, end, transpose=False):
-    angle = atan2(end[1] - start[1], end[0] - start[0])
+    """counterclockwise, 0 is down"""
+    angle = atan2(end[0] - start[0], end[1] - start[1])
     if transpose:
         angle = -angle - pi
     return angle