Tracklist
| Emerson | 1:26 | |
| Watchers | 5:17 | |
| Unison | 5:25 | |
| Secrets | 5:10 | |
| Forward | 4:42 | |
| Wreckage | 4:56 | |
| Walk On Stars | 4:46 | |
| Euphoria | 5:08 | |
| Traveler | 5:03 | |
| Lethargy (Rise) | 4:37 | |
| Systems | 4:10 | |
| Inner Light | 6:59 | |
| Immersion | 2:04 | |
| Forward (Club Mix) | 4:29 | |
| Wreckage (Torben Wendt Remix) | 5:35 | |
| Forward (Dark Angel Remix) | 5:11 | |
| Traveler (Flesh & Blood Remix) | 4:33 | |
| Unison (Statesman Remix) | 5:35 | |
| Forward (The Dreamside Remix) | 4:37 | |
| Traveler (Symphonic Mix) | 4:37 | |
| Forward (Ophidian Remix) | 5:07 | |
| Watchers (Axel Ermes Remix) | 8:47 | |
| Wreckage (Silent Version) | 5:25 | |
| Darkness (Live At M'era Luna 2002) | 4:56 | |
| Stronghold (Live At RTV Rijnmond 2005) | 5:25 |
Versions
| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| Unison (CD, Album + CD, Enh, Ltd) | Out Of Line | OUT 251 | OUT 252 | Germany | 2007 | |
| Unison (CD, Album) | Metropolis | MET 471 | US | 2007 | |
| Unison (File, AAC) | Metropolis | MET 481 | US | 2007 |