| 2021-10-01 |  The Industrial Connection Vol. 4 @ trench @ 2021-09-17 | 1 | Hard Techno | Gregor Size - Observer (Original Mix)6:57 | |
| 2021-10-01 | The Industrial Connection Vol. 4 @ trench @ 2021-09-17 | 5 | Hard Techno | Gregor Size - Observer (DJ D ReDD Remix)7:31 | |
| 2021-10-01 | The Industrial Connection Vol. 4 @ trench @ 2021-09-17 | 6 | Hard Techno | Gregor Size - Observer (Makaja Gonzales Remix)6:00 | |
| 2021-10-01 | The Industrial Connection Vol. 4 @ trench @ 2021-09-17 | 7 | Hard Techno | Gregor Size - Observer (El Brujo Remix)6:16 | |