You can made sine wave sound like this in Unity
using UnityEngine; public class SineGanerator : MonoBehaviour { private AudioSource AudioSource; [SerializeField, Range(0, 1)] private float Volume = 1; [SerializeField, Range(100, 1000)] private int Frequency = 440; private const float PI_2 = 2 * Mathf.PI; private int SampleRate; private float Phase; private void Awake() { AudioSource = gameObject.AddComponent<AudioSource>(); SampleRate = AudioSettings.outputSampleRate; } private void OnAudioFilterRead(float[] data, int channels) { var samples = data.Length / channels; for (var i = 0; i < samples; ++i) { var value = GetNextSample(); for (var ch = 0; ch < channels; ++ch) { data[i * channels + ch] = value; } } } private float GetNextSample() { Phase += Frequency * PI_2 / SampleRate; Phase %= PI_2; return Mathf.Sin(Phase) * Volume; } }