Updated practice clock to use a zero exclusive display (matches offical clock better), tweaked sound timings a bit to match, disabled color changing on clock to match offical clock, misc. tweaks.

lib/states/boot.rb

@@ -46,6 +46,7 @@ module TAC
       def button_down(id)
         super
 
+        pop_state
         push_state(@next_state)
       end
     end