tweak

robs_metronome.html

@@ -330,6 +330,9 @@
           accept="application/json"
           style="display: none"
         />
+        <a href="https://tuner-online.com/#sounds" target="_blank">
+          <button>Guitar Tuner</button>
+        </a>
       </div>
       <div class="status" id="statusMsg"></div>
     </div>

tunes.json

@@ -8,5 +8,10 @@
     "id": "mu2qn0pc",
     "name": "Serenata Espagnola",
     "bpm": 110
+  },
+  {
+    "id": "mu3deuwo",
+    "name": "Scales in 1/4 & 1/16",
+    "bpm": 95
   }
 ]