Additional Filter LFO
An additional filter LFO is accessible via midi CC controls.
•
Frequency range: 0.1 Hz – 1000 Hz
•
Free running or midi sync with adjustable divider
•
Triangle, Saw, Inverted Saw, Square and Random waveforms
Audio frequency modulation is possible and can create novel sounds usually not possible
with the SK-series synths.
Warning: Due to the filter IC suffering from some amount of CV bleed-through, the LFO
signal may be audible directly. This is especially the case with high LFO frequencies
and/or waveforms with discontinuities (all except triangle).
Parameter
Midi CC
Range
LFO amount
20
0 - 127
LFO frequency
21
0 - 127
LFO shape
22
0 - 127
LFO free / synced
24
0 – 63: FREE, 64 – 127: Synced
LFO clock divider
23
0 - 127
0 - 25
26 - 51
52 – 77
78 - 103
104 - 127
Triangular
Saw
Inverted Saw
Square
Random
Midi CC values for the various LFO shapes
0 – 6
7 – 13
14 – 20
21 – 27
28 – 34 35 - 41
42 - 48
49 - 55
56 - 62
4 Bars
3 Bars
2.5 Bars
2 Bars
1.5 Bars
1 Bar
3 / 4
1 T
1 / 2
63 – 69
70 – 76
77 – 83
84 – 90
91 – 97 98 – 104 105 – 111 112 – 118 119 - 125
3 / 8
1 / 2 T
1 / 4
3 / 16
1 / 4 T
1 / 8
3 / 32
1 / 8 T
1 / 16
Midi CC values for the LFO clock divider in synced mode
VAL Period
VAL f[Hz]
VAL f[Hz]
VAL f[Hz]
VAL f[Hz]
VAL
f[Hz]
VAL
f[Hz]
VAL
f[Hz]
0
20 s
16 0.25
32 4.25
48 8.25
64 32.5
80
72.5
96
225
112
625
1
19 s
17 0.33
33 4.5
49 8.5
65 35
81
75
97
250
113
650
2
18 s
18 0.5
34 4.75
50 8.75
66 37.5
82
77.5
98
275
114
675
3
17 s
19 1
35 5
51 9
67 40
83
80
99
300
115
700
4
16 s
20 1.25
36 5.25
52 9.25
68 42.5
84
82.5
100 325
116
725
5
15 s
21 1.5
37 5.5
53 9.5
69 45
85
85
101 350
117
750
6
14 s
22 1.75
38 5.75
54 9.75
70 47.5
86
87.5
102 375
118
775
7
13 s
23 2
39 6
55 10
71 50
87
90
103 400
119
800
8
12 s
24 2.25
40 6.25
56 12.5
72 52.5
88
92.5
104 425
120 825
9
11 s
25 2.5
41 6.5
57 15
73 55
89
95
105 450
121 850
10 10 s
26 2.75
42 6.75
58 17.5
74 57.5
90
97.5
106 475
122 875
11 9 s
27 3
43 7
59 20
75 60
91
100
107 500
123 900
12 8 s
28 3.25
44 7.25
60 22.5
76 62.5
92
125
108 525
124 925
13 7 s
29 3.5
45 7.5
61 25
77 65
93
150
109 550
125 950
14 6 s
30 3.75
46 7.75
62 27.5
78 67.5
94
175
110
575
126 975
15 5 s
31 4
47 8
63 30
79 70
95
200
111
600
127 1000
