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AMS Mixers : creating audible LFOs

 
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Liviou2004
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Joined: 20 Feb 2017
Posts: 472
Location: Fontainebleau - France

PostPosted: Tue May 29, 2018 11:29 am    Post subject: AMS Mixers : creating audible LFOs Reply with quote

A french Kronos contributor, alias Coyote14, has made a very good youtube video about AMS Mixer. (https://www.youtube.com/watch?v=Q2mwwD6F5Lg&t=386s)
He said that it is possible to put LFO in audible range, thanks to AMS Mixer.
Did you ever try this ?

And, if you succeeded, do you know the max value of frequency that can be reached thanks to this method ?

Thank you
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CharlesFerraro
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Joined: 06 Feb 2010
Posts: 821
Location: California

PostPosted: Tue May 29, 2018 11:56 am    Post subject: Reply with quote

I added the entire list of LFO rates to the stickied Resources and Information thread:

FREQUENCY VALUE > FREQUENCY IN HERTZ

0 > 0.014305
1 > 0.019073
2 > 0.024796
3 > 0.031471
4 > 0.039101
5 > 0.047684
6 > 0.05722
7 > 0.067711
8 > 0.080109
9 > 0.094414
10 > 0.11158
11 > 0.131607
12 > 0.154495
13 > 0.179291
14 > 0.205994
15 > 0.235558
16 > 0.267982
17 > 0.303268
18 > 0.340462
19 > 0.379562
20 > 0.421524
21 > 0.466347
22 > 0.51403
23 > 0.563621
24 > 0.61512
25 > 0.669479
26 > 0.7267
27 > 0.786781
28 > 0.84877
29 > 0.912666
30 > 0.979423
31 > 1.049042
32 > 1.121521
33 > 1.195908
34 > 1.272201
35 > 1.351356
36 > 1.433372
37 > 1.518249
38 > 1.605034
39 > 1.693726
40 > 1.785278
41 > 1.879692
42 > 1.976967
43 > 2.076149
44 > 2.177238
45 > 2.281189
46 > 2.388
47 > 2.496719
48 > 2.608299
49 > 2.72274
50 > 2.839088
51 > 2.958298
52 > 3.079414
53 > 3.203392
54 > 3.330231
55 > 3.458977
56 > 3.590584
57 > 3.724098
58 > 3.860473
59 > 3.99971
60 > 4.140854
61 > 4.284859
62 > 4.430771
63 > 4.579544
64 > 4.731178
65 > 4.88472
66 > 5.041122
67 > 5.199432
68 > 5.360603
69 > 5.524635
70 > 5.690574
71 > 5.859375
72 > 6.030082
73 > 6.203651
74 > 6.380081
75 > 6.558418
76 > 6.739616
77 > 6.922722
78 > 7.108688
79 > 7.297516
80 > 7.48825
81 > 7.681846
82 > 7.877349
83 > 8.075714
84 > 8.276939
85 > 8.480072
86 > 8.686065
87 > 8.893966
88 > 9.104728
89 > 9.318351
90 > 9.533882
91 > 9.752273
92 > 9.972572
93 > 10.499954
94 > 11.666297
95 > 13.125419
96 > 15.000343
97 > 17.499923
98 > 20.999907
99 > 26.249884

99 + Fine 99 > 32.0

BOOSTED VALUE > FREQUENCY IN HERTZ (boosted via full-volume positive AMS source)

100 > 32
110 > 48.7
120 > 74.13
130 > 112.84
140 > 171.73
150 > 261.44
160 > 397.92
170 > 605.67
175 > 750

You can calculate the output when using the Frequency Fine parameter by dividing the Fine parameter value by 99 and then calculating that percentage between the current and next value:

Converting from values to hertz:
(fine/99) * (Higher Hz - Lower Hz) + Lower Hz

Example: "If the LFO frequency is 47 and the fine frequency is 73: First find entry 47 in the table. That value is 2.496719 Hz. The very next entry in the table is 2.608299 Hz. Use the fine control to find the point 73% of the way between these two values.
fine tune = (73/99) * (2.608299 - 2.496719) which is 0.082276162. Then the final result is
2.496719 + 0.082276162 = 2.578995162 Hz."

Inverse equation for finding what values are closest to a target frequency:
(Target - Lower Hz) / (Higher Hz - Lower Hz) = (solution) * 99

More information can be found here: http://www.korgforums.com/forum/phpBB2/viewtopic.php?t=110943

You might also be interested in http://www.korgforums.com/forum/phpBB2/viewtopic.php?p=726460&highlight=#726460
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Liviou2004
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Joined: 20 Feb 2017
Posts: 472
Location: Fontainebleau - France

PostPosted: Tue May 29, 2018 12:24 pm    Post subject: Reply with quote

What a job you did !! Thank you very much !

That way I suppose we can create an FM or AM or Ring Modulator config with LFO as a Modulator and OSC as a carrier.

But is there a way to use such a boosted LFO as a real OSC source ? And how is it possible ?

Thanks
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CharlesFerraro
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Joined: 06 Feb 2010
Posts: 821
Location: California

PostPosted: Tue May 29, 2018 1:39 pm    Post subject: Reply with quote

Liviou2004 wrote:

But is there a way to use such a boosted LFO as a real OSC source ? And how is it possible ?


Use the MS-20EX engine to patch an audio rate LFO coming from either the Mod Wheel or Mod Switch output jacks into the VCA IN jack. Or any jack whose signal flow leads to the main out.
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Liviou2004
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Joined: 20 Feb 2017
Posts: 472
Location: Fontainebleau - France

PostPosted: Tue May 29, 2018 2:18 pm    Post subject: Reply with quote

Good Idea !

Thanks
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timbukktwo
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Joined: 09 Dec 2007
Posts: 255

PostPosted: Tue May 29, 2018 6:53 pm    Post subject: Reply with quote

CharlesFerraro-

Thanks for this. I knew the LFO rate was quite high at about 350hz (I thought this was AFTER the AMS boost); I didn’t know it could go up to 750hz (with the AMS boost)! Wow! I have to tie my Kronos down!
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CharlesFerraro
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Joined: 06 Feb 2010
Posts: 821
Location: California

PostPosted: Tue May 29, 2018 8:22 pm    Post subject: Reply with quote

timbukktwo wrote:
CharlesFerraro-

Thanks for this. I knew the LFO rate was quite high at about 350hz (I thought this was AFTER the AMS boost); I didn’t know it could go up to 750hz (with the AMS boost)! Wow! I have to tie my Kronos down!


I did notice last night that the noise waveforms do seem to go past the 175 mod intensity limit.
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timbukktwo
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Posts: 255

PostPosted: Tue May 29, 2018 9:14 pm    Post subject: Reply with quote

Okay. It’s interesting that digital can be ‘pushed’ to its limits, too, I guess.
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