Add global var so you don't have to remember 640hz

conf/vanilla/vars.xml

@@ -231,6 +231,7 @@
   <X-PRE-PROCESS cmd="set" data="uk-ring=%(400,200,400,450);%(400,2000,400,450)"/>
   <X-PRE-PROCESS cmd="set" data="us-ring=%(2000,4000,440,480)"/>
   <X-PRE-PROCESS cmd="set" data="bong-ring=v=-7;%(100,0,941.0,1477.0);v=-7;>=2;+=.1;%(1400,0,350,440)"/>
+  <X-PRE-PROCESS cmd="set" data="beep=%(1000,0,640)"/>
   <X-PRE-PROCESS cmd="set" data="sit=%(274,0,913.8);%(274,0,1370.6);%(380,0,1776.7)"/>
   <!--
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