How to make an inverted ADSR envelope?

#1

I'm trying to patch a synth where the envelope closes up the filter (- value) instead of opens it up (+ value) when triggered. To reference what I'm talking about, the Intellijel Dual ADSR module has this sort of CV out on it.

#2

Did you try with an inverter object after the envelope output?
My board is not connected though, so it is not tested.

#3

...and then add 64 with "math/+c"

#4

Thanks! That worked exactly as I hoped. Curious what the +c does in this instance? Most of the math objects are still quite confusing to me. A lot of trial and happy accidents in my patches so far.

#5

"add constant", if you put your mouse pointer ("hover") over the title bar of objects, this explanation will pop up.
"disp/chart b" may help by showing the value while running.

How can it be made less confusing?
I could add a "math/complement" object, combining math/inv and math/+c 64. But then the list of objects gets longer. Or maybe complement is not a clear name for this, but not sure what would be the right name...

#6

I think what makes it confusing for some is the lack of context for what the thing actually does, if someone doesnt understand the effect the item produces it can seem a bit like a black box. In goes a thing, out comes something else, for no known reason. I dont see much of a way around that though, short of really long descriptions on everything. I for instance have a similar thing happen with the "log" function. If i put a wave form into the "log" it comes out wildly different, but i dont know why that is, nor what it is really doing.

#7

"log", logarithm is a fundamental mathematical function. Either you know it, and then the explanation is adequate I believe, or either you don't. If you do not know logarithms, that's fine, you can use it as a black box. Explaining the mathematical properties of the logarithm function would be long and boring - https://en.wikipedia.org/wiki/Logarithm - and may still fail to explain why and where you'd use it in a patch.
I see the help patch in objects/math/log_exp.axh is not linked to the math/log and math/exp objects. But it does not explain anything, it was only made to test these objects.
I welcome suggestions how to make things more clear.

#8

Honestly i think things are as clear as is necessary. Being non formally versed in advanced mathematics, no amount of description is really going to help one such as myself to understand such a thing. A description isnt a substitute for something that you really need to learn in a school heh.