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Asif Ali

Automating prochannel eq frequency

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Hi how is the node level in the automation lane related to the frequency when automating the frequency in the prochannel eq? Eg. 0 = 20hz, 100 = 20000hz.  I wish to type in level percentages to achieve frequency values

eq.PNG

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The node value is a percentage value between 0 and 100.

The easiest way to set it to a specific value is:

1. Set the Now time over the node you want to edit
2. Move node up and down, looking at the widget display ( the one that shows 447.7Hz on your screenshot).  Holding down SHIFT will lock the node horizontally while you move it vertically.

This should give you some idea of the percentage/freq relationship.  It's a logarithmic scale, but I've flattened it to make it easier to look up:

image.thumb.png.4ef9c00702facdc98bdada3ed2073e6b.png

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Hi, thanks for this, I would like to get much more granular, do you happen to know the formula? I can cope with maths 

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looking at the list it would appear that each of Mark's test where an increase of 10 is roughly an octave (20, 40, 80, 160, etc). but if you produced a finer granularity for your own as testing as Mark described, you could likely map to whatever range you wanted. it's likely different EQ types will have different slopes so you may want to test for each of the 4 EQ types.

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If you would like a formula, this one matches the data in msmcleod's chart:

Frequency = 20*10^((Setting/100)*3)

where Setting is a number from 0 through 100 (0% through 100%)

Please note that this just gives you the center frequency. As the others pointed out, the shape of the curve depends on which of the four EQ types you choose.

 

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