I got my long required inspiration and finally learned to play "piano" (M-Audio Oxygen 88) with the help of Synthesia software and Dire Dire Docs song converted into MIDI and SF2 files. It took about seven weeks after persistent training but I finally learned to play "my" first song (Dire Dire Docs) with pretty good results.

Finally I started to play without Synthesia and used Roland MT-32 (old model, the one without headphone socket) for sound output with the following settings:

Reverb mode: 8

Hope you enjoy!

Cheers! =)