I can access the link quite well from my side of the world. The following link would be interesting to you in particular. It is a Piano with touch keys done using the PIC_OSA (RTOS) using a PIC and wave tables. I suggest you try bending your access with a proxy server if you still find it hard to reach.
http://www.pic24.ru/doku.php/en/osa/.../pk2_osa_piano