| Name | Format | Duration | Size | Date | |
|---|---|---|---|---|---|
| UHUH.WAV | Waveform Audio File Format | 2s | 26KB | 1993-07-11 | |
| UNKNOWN.WAV | Waveform Audio File Format | 3s | 43KB | 1994-05-05 | |
| UNMARK.WAV | Waveform Audio File Format | 0.05s | 10KB | 1993-02-07 | |
| UP.WAV | Waveform Audio File Format | 0.05s | 18KB | 1994-04-01 |