First of all, this is awesome!<p>Maybe my ears are messed up, but I seem to be hearing that the &quot;Keys&quot; sounds are interrupting each other, in a way that none of the other sounds seem to do. That is, if you play two of them simultaneously, only one will be heard. If you play one a fraction behind another the first will be preempted. Normally the &quot;Keys&quot; sounds have a lovely sustain, so this disappoints.<p>This is on Chrome 47.0.2526.110.