Tracklist
| Headache | 4:21 |
| Quark | 4:45 |
| Sequencial | 4:34 |
| Sequencial (Reprise) | 0:09 |
| Interference | 4:34 |
| Neuron (Bonus Track) | 4:06 |
Versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| PF007 | Solid State | Quark EP (12", EP) | Peacefrog Records | PF007 | UK | 1992 |
| X-12114 | Solid State | Quark EP (12", EP) | X-Energy Records | X-12114 | Italy | 1992 |
| X-12114 | Solid State | Quark EP (12", EP, Promo) | X-Energy Records | X-12114 | Italy | 1992 |
| PF007 | Solid State | Quark EP (12", EP, Promo, W/Lbl) | Peacefrog Records | PF007 | UK | 1992 |
