This is my second attempt at an audiogame. This one is very simple, and probably too easy to be all that much fun, but is hopefully quite a lot more playable than my last attempt. It'd be helpful to know how easy people find to play it. I'm planning to use this as a component of something larger and more complex if it works out.
http://you.mongle.me/games/soundmapi.html
There are keyboard controls, but I don't know that I explained them all that well on the site/readme - it's really designed for an xbox 360 controller (though I think any controller with an analogue stick and a button should work...)