private void Update()
        {
            bool surfaceChange = false;

            if (Input.GetKeyDown(KeyCode.D))
            {
                surface += 1;
                if (surface > 2)
                {
                    surface = 0;
                }

                surfaceChange = true;
            }

            else if (Input.GetKeyDown(KeyCode.A))
            {
                surface -= 1;
                if (surface < 0)
                {
                    surface = 2;
                }

                surfaceChange = true;
            }

            //Assigns a different Audio Object to the Runtime Identifier "surfaceSound" when surface changes
            if (surfaceChange)
            {
                switch (surface)
                {
                case 1:
                    MultiAudioManager.AssignRuntimeIdentifierAudioObject(surfaceSoundIdentifier, metalSfx);
                    break;

                case 2:
                    MultiAudioManager.AssignRuntimeIdentifierAudioObject(surfaceSoundIdentifier, waterSfx);
                    break;

                default:
                    MultiAudioManager.AssignRuntimeIdentifierAudioObject(surfaceSoundIdentifier, concreteSfx);
                    break;
                }

                surfaceChange = false;
            }
        }