# Playing simple sounds

**URL:** <https://forum.castle-engine.io/t/playing-simple-sounds/504>\
**Category:** Uncategorized\
**Created:** [January 24, 2022, 5:46pm UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504 "2022-01-24T17:46:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Carring](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/carring/32/1950_2.png) [@Carring](https://forum.castle-engine.io/u/Carring)\
**Post date:** [January 24, 2022, 5:46pm UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504/1 "2022-01-24T17:46:57Z")

</div>

Hi,

How can I loop a sound (wave), stop playing it or start or stop playing from a certain point?  
Sound1 has to loop, Sound2 only play once and then stop on a certain condition (not playing it to end).

I have this relevant code:

Sound1, Sound2: TCastleSound;

Sound1.URL:= ‘castle-data:/sounds/westbeach\_sound.wav’;  
Sound1.Volume:= 0.5;  
SoundEngine.Play(Sound1);

Sound2.URL:= ‘castle-data:/sounds/boatstop.wav’;  
Sound2.Volume:= 0.5;  
SoundEngine.Play(Sound2);

// in cge editor  
Sound1 := DesignedComponent (‘Sound1’) as TCastleSound;  
Sound2 := DesignedComponent (‘Sound2’) as TCastleSound;

There is no Stop property so I did a Sound2.Volume := 0 but then the wave is still active and consuming memory.

---

<div class="post-metadata">

**Author:** ![michalis](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/michalis/32/3_2.png) [@michalis](https://forum.castle-engine.io/u/michalis)\
**Post date:** [January 25, 2022, 9:26am UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504/2 "2022-01-25T09:26:54Z")

</div>

The control the playback of sound, you need to use additional `TCastlePlayingSound` class, see brief note on [Sound | Manual | Castle Game Engine](https://castle-engine.io/manual_sound.php) . The instance of `TCastlePlayingSound` refers to `TCastleSound`. Like this:

Declare PlayingSound1:

```auto
  PlayingSound1: TCastlePlayingSound;

```

Play using PlayingSound1:

```auto
PlayingSound1 := TCastlePlayingSound.Create(...); // assign any owner, like FreeAtStop if inside the state, or just nil
PlayingSound1.Sound := Sound1;
PlayingSound1.Loop := true; // use this to make sound looping
SoundEngine.Play(PlayingSound1);

```

So instead of `SoundEngine.Play(Sound1)` you now do `SoundEngine.Play(PlayingSound1)`. And you get more control – you can play looping, you can stop at any time you want etc.

Now you can call whenever you want:

```auto
PlayingSound.Stop;

```

Note that there are other ways to control a looping sound:

1. You can use `SoundEngine.LoopingChannel`, comfortable if this is a music track.

2. You can also use `TCastleSoundSource`, which you can set up in the editor, and then do

---

<div class="post-metadata">

**Author:** ![Carring](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/carring/32/1950_2.png) [@Carring](https://forum.castle-engine.io/u/Carring)\
**Post date:** [January 26, 2022, 6:29am UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504/3 "2022-01-26T06:29:11Z")

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Thanks, this is all I need and it works. 😀  
One more question: How can I fade out a sound? Should I put the PlayingSound.Volume in a loop or is there a more convenient way than something like this:

var VolumeValue: single;

while PlayingSound.Volume \> 0 do  
begin  
PlayingSound.Volume := VolumeValue - 0.05;  
end;

---

<div class="post-metadata">

**Author:** ![eugeneloza](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/eugeneloza/32/12_2.png) [@eugeneloza](https://forum.castle-engine.io/u/eugeneloza)\
**Post date:** [January 26, 2022, 7:02am UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504/4 "2022-01-26T07:02:37Z")

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You can do it like

```auto
while PlayingSound.Volume > 0 do
begin
   PlayingSound.Volume := PlayingSound.Volume - 0.05;
   Sleep(100);
end;

```

However, it’ll force the app to stop responding for some time. Therefore putting this in `Update` is the way to go:

```auto
procedure TMyUiState.Update(const SecondsPassed: Single);
begin
  inherited;
  if (DoFadeOut) and (PlayingSound.Volume > 0) then
     PlayingSound.Volume := PlayingSound.Volume - 0.5 * SecondsPassed;
  else
    DoFadeOut := false;
end;

```

Or maybe better override `TCastlePlayingSound` and add `Update`, `FadeIn` and `FadeOut` routines, so that in `TMyUiState.Update` you won’t need to handle logic for all available sounds but only call `SomeSound.Update;`.

Note that if you would want to use the overridden component in the Castle Editor you’ll have to add it to custom components. See [Custom Components | Manual | Castle Game Engine](https://castle-engine.io/custom_components)

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<div class="post-metadata">

**Author:** ![Carring](https://forum.castle-engine.io/user_avatar/forum.castle-engine.io/carring/32/1950_2.png) [@Carring](https://forum.castle-engine.io/u/Carring)\
**Post date:** [January 26, 2022, 7:10am UTC](https://forum.castle-engine.io/t/playing-simple-sounds/504/5 "2022-01-26T07:10:26Z")

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Ok, thanks for replying!  
😃