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 Forum index » Clavia Nord Modular » NM Classic (NM1 or G1)
exponential mod-amount knob
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tomtakestooth



Joined: Jan 07, 2009
Posts: 20
Location: London

PostPosted: Thu May 15, 2014 5:23 am    Post subject: exponential mod-amount knob
Subject description: maths behind it
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Hi guys. I am trying to recreate some patches from my old nord micromodular in NI Reaktor. One of the main things I've been struggling with is trying to recreate the mod-amount knob properly.

From the nord manual:

[TYPE II]
The mod-amount knob attenuates the incoming signal in an exponential fashion. A setting of 127 (max-
imum) leaves the incoming signal unaffected, a setting of 64 attenuates the incoming signal by a factor
considerably less than 0.5 (leaving less than half of the level of the incoming signal to modulate). A setting
of 0 shuts off the modulation completely. The pitch mod-input on the various oscillators are examples of
Type II attenuation.


My maths isn't great, but i understand that the knob works exponentially. I've managed to find create a knob that is very close but not exact. Does anyone know what the mathematical function is for this knob. I'm assuming it's something like x=a^b, where a is a range between 0 and 1.

Please excuse my lack of proper math terminology....

If anyone knows what I'm trying to get at and can help, that would be very much appreciated.

As I don't have the micromodular to do tests with, it's become quite difficult to work this out... all i can go by is recordings I've done with it...

-T
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 79
Location: Kebek
G2 patch files: 12

PostPosted: Thu May 15, 2014 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi tomtakestooth,

I think you can have a look to the "Bessel-functions". I'm not 100% sure.

Quote:
As I don't have the micromodular to do tests

Can you use the G2 demo software ?

Smile
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