# I need to add sound to my car in my 3d car game but I don't know how to add sound.

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I need to add sound to my car in my 3d car game but I don’t know how to add sound.

So how do I adjust the pitch of the sound? For example, if I do it according to the engine speed of the vehicle, how will I calculate the engine speed of the vehicle? Please help me!

Adjust the speed of the car according to the “Volume” of “AudioStreamPlayer”.
Example: If the max speed of the car is 100 (100 / 4 = 25)

ramazan | 2022-10-10 08:21

When you say maximum speed, do you mean the current speed of the vehicle?

Gangster53 YT | 2022-10-10 12:14

Here is the code I use for my vehicle:

``````var maximum_speed_it_can
var speed_kmh
var MAX_ENGINE_FORCE = 200.0

func _physics_process(delta):
var steer_val = 0.0
var throttle_val = 0.0
var brake_val = 0.0

if Input.is_action_pressed("forward"):
throttle_val = 1.0
elif Input.is_action_pressed("brake"):
brake_val = 0.5

if Input.is_action_pressed("left"):
steer_val = 1.0
elif Input.is_action_pressed("right"):
steer_val = -1.0

engine_force = throttle_val * MAX_ENGINE_FORCE
brake = brake_val * MAX_BRAKE
steering = lerp(steering, steer_val * MAX_STEERING, STEERING_SPEED * delta)
``````

To find the speed of my vehicle:

``````	speed_kmh = linear_velocity.lenght()
``````

And to find the maximum speed it can do:

``````	maximum_speed_it_can = int(MAX_ENGINE_FORCE / 0.5567928730512249)
``````

This gives me approximately the maximum speed the car can actually do.

Gangster53 YT | 2022-10-10 12:32

I found this suggestion - so maybe if you combine that answer with the comment above, you will have:

1. Vehicle speed; use to calculate a factor that makes the pitch change sound good.
2. The `AudioStreamPlayer` which plays the sound; change the `pitch_scale` to make the sound play slower or faster.

Does that help?

I understand what you mean, but how can I do it? So, I don’t know how to set the pitch scale of AudioStreamPlayer according to what my car is. If you could learn the engine speed of my car, I would adjust the pitch scale accordingly, but I can’t find the engine speed of the car either.

Gangster53 YT | 2022-10-11 13:05

``````var MAX_ENGINE_FORCE = 200.0

var sound_db : float

func _process(delta):
#sound_db = MAX_ENGINE_FORCE / 8 ## max volume_db 25
#correcting
sound_db = speed_kmh / 8 ## max volume_db 25
\$AudioStreamPlayer.set_volume_db(sound_db)
``````

ramazan | 2022-10-12 09:55

The speed you have in the previous answer?