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

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