soundmap i (audiogame)

Hello, I am playing at making audiogames (games where the only output is audio). I created a very unplayable one for Ludum Dare and with feedback from that I have created a proof of concept for an audiogame interface idea:

http://you.mongle.me/games/soundmapi.html

The game is very simple and easy; I would like feedback on how easy it is to understand the meaning of the audio output and how easy it is to visualise and learn the layout of the map each time. The audio itself is pretty shoddy, I know.

I'm also made mouse / keyboard analogue stick emulators for it, so any feedback on how they could be improved would be appreciated as well.

Thanks.