# params var (sound)

Source: https://ref.dm-lang.org/sound/var/params
Added in BYOND 515.

### Default value
> null

Used to set client skin information related to this sound. This can be set to an [associative list](https://ref.dm-lang.org/list/associations.md) or a parameter string such as you would get from [list2params()](https://ref.dm-lang.org/proc/list2params.md).

These are the parameters currently defined:

- **on-end**: Plays when the sound ends or is stopped.
- **on-preempt**: Plays when the sound is preempted by another sound. If this isn't present, `on-end` still applies if the sound is preempted.

```dm
mob/proc/PlayIntro()
    var/sound/S = sound('intro.ogg')
    S.params = list("on-end" = ".intro-ended")
    src << S

mob/verb/_Intro_Ended()
    set name = ".intro-ended"
    src << "The intro has concluded."
```

### See also
> [vars (sound)](https://ref.dm-lang.org/sound/var/index.md)