Stylophone mods?

I just got a Stylophone (http://www.dubreq.com) for xmas…

Im not an expert in electronics (but working on it slowly, kind of know lots of bits but not enough to build anything from scratch) and i was wondering if any of you could help put any examples of this?

Looks like a nice add-on for the werkstatt :smiley:

maybe this? May be a bit overkill, but the case doesn’t need to be that big. Plus, it could probably work just fine on the Werkstatt +/-9V power rails. Looks like R4 will need to be adjusted, but that’s it.