tl7.js : Improved sync of mf-5 to af-10.

src/kc/data/tl7.js

         label: "mf-5"         
         type: "mf"         
         ref: "af-10"         
-        offset: 30091200         
+        offset: 29889200  // 30091200         
         smpCnt: 251445617         
         trackId: 4         
         textStr: "midi/6.Mid"