This is what I hear:
1. A bunch of weird noises coming from a synthesizer.
2. Then the acoustic guitar comes in with an echo to it.
3. Mike Portnoy starts hitting the drums
4. Another strum of an acoustic guitar with another echo.
5. Then there are four electric guitar chords and then the music kicks in with the main riff.
The only acoustic guitar parts I hear are those two sturms with the echo. Maybe I'm missing something. I don't know of any other acoustic guitar parts in this song. That tab I gave you looks fine to me, but then again, I'm not a guitar player. But I can play the piano well, so if you need help with chords, I can be of a better help there.
Bio Fox...four guys, one computer, games like nobody's business.