random chord method checks for distinct members

index.html

@@ -112,6 +112,7 @@
                 <button id="mute-all">Mute all oscillators</button>
                 <button id="reset-lfos">Reset LFO values to default</button>
                 <button id="rand-chord">Full random chord</button>
+                <button id="eval-chord">Evaluated chord</button>
             </div>
         </main>