He prolly bases his trigger on a 1x1 location with no hyper triggers oni it. It's quite simple.
| Trigger |
| Description: |
| Move sounds |
|
| Players: |
| ¤ Player X |
| Conditions: |
| ¤ Current Player controls 0 unit at location. |
| Actions: |
¤ Play Wav
|
| ¤ Preserve Trigger |
| Trigger |
| Description: |
| Location movement |
|
| Players: |
| ¤ Player X |
| Conditions: |
| ¤ Always |
| Actions: |
¤ Move location to follow unit
|
¤ Wait X milliseconds(Very low quantity)
|
| ¤ Preserve Triger |
The trigger is very simple and works like this:
The unit has a very small location 1x1 around it. When the unit moves to any direction the game will detect that there is no unit at that location thus making it seem like the game detects when the unit moves.
When there is no unit in the location it means the unit started moving and the wav plays.
The Move location trigger is always working to ensure that it keeps on working.
I'm not sure on how to make it stop playingt the wav when the unit stops moving. I think that one way would be to play a wav that has silent sounds.