I&#x27;m the main guy who makes Soundslice. :) Yes, we launched the video annotation tool in 2012 and shifted focus to the sheet-music version in 2014. Our number one bit of feedback was: &quot;Please add support for standard notation!&quot; -- hence the shift.<p>Here&#x27;s a tech talk I gave about that original Soundslice version: <a href="http:&#x2F;&#x2F;37signals.com&#x2F;talks&#x2F;soundslice" rel="nofollow">http:&#x2F;&#x2F;37signals.com&#x2F;talks&#x2F;soundslice</a>