#### Associating Low-pass and High-pass Filter Values with their Corresponding Cutoff Frequencies

In order to save CPU usage at runtime and to use the same model for low-pass filter and high-pass filter as for volume, pitch, and LFE (which is relative through the hierarchy), the low-pass and high-pass filter properties have been normalized between 0 and 100%.

##### Example of LPF values' corresponding cutoff frequencies

Imagine a sound structure with a sound and a container where:

• LPF on Sound = 15%

• LPF on Container = 30%

In this scenario, the final LPF that will be applied at runtime is 45%, which represents a cutoff frequency of 1,922 Hz.

Using real cutoff frequency values for the low-pass filter in Wwise would have looked something like this:

• LPF on Sound = 13,500 Hz

• LPF on Container = 7,000 Hz

In this example, defining the final cutoff frequency at runtime would have been unclear.

##### Wwise LPF and HPF Value Cutoff Frequencies

The following table provides an approximate correspondence between Wwise LPF/HPF values, ranging from 0 to 100, and the actual cutoff frequency in Hertz. This is intended as a simplified guide to the Wwise relative value system for LPF and HPF; your real cutoff frequencies may be slightly different.

LPF Value:

Cutoff Frequency (Hz):

HPF Value:

0

20,000

100

1

19,567

99

2

19,133

98

3

18,700

97

4

18,267

96

5

17,833

95

6

17,400

94

7

16,967

93

8

16,533

92

9

16,100

91

10

15,667

90

11

15,233

89

12

14,800

88

13

14,367

87

14

13,933

86

15

13,500

85

16

13,067

84

17

12,633

83

18

12,200

82

19

11,767

81

20

11,333

80

21

10,900

79

22

10,467

78

23

10,033

77

24

9,600

76

25

9,167

75

26

8,733

74

27

8,300

73

28

7,867

72

29

7,433

71

30

7,000

70

31

6,422

69

32

5,892

68

33

5,405

67

34

4,959

66

35

4,550

65

36

4,174

64

37

3,829

63

38

3,513

62

39

3,223

61

40

2,957

60

41

2,713

59

42

2,489

58

43

2,283

57

44

2,095

56

45

1,922

55

46

1,763

54

47

1,618

53

48

1,484

52

49

1,361

51

50

1,249

50

51

1,146

49

52

1,051

48

53

964

47

54

885

46

55

812

45

56

745

44

57

683

43

58

627

42

59

575

41

60

528

40

61

484

39

62

444

38

63

407

37

64

374

36

65

343

35

66

315

34

67

289

33

68

265

32

69

243

31

70

223

30

71

204

29

72

188

28

73

172

27

74

158

26

75

145

25

76

133

24

77

122

23

78

112

22

79

103

21

80

94

20

81

86

19

82

79

18

83

73

17

84

67

16

85

61

15

86

56

14

87

51

13

88

47

12

89

43

11

90

40

10

91

36

9

92

33

8

93

31

7

94

28

6

95

26

5

96

24

4

97

22

3

98

20

2

99

18

1

100

17

0