it all ready has a curve you just dont see it. I am sure these are 2 pole filters and so this has its own inherent curve already.
its not something you can understand unless you are familiar with the mathematics of filters. ie
http://www.timstinchcombe.co.uk/index.php?pge=polesthere that saves me explainin it.
So its just a graphical representation of a filter, and therefore I do believe it gives you a good idea, but not absolute true real life curve of ADSR.
See its complicated, and so we dont see that, instead we see an artists impression to what is really going on.
http://www-k.ext.ti.com/SRVS/Data/ti/Kn ... aqs/lp.htmthats a simple idea, and its mathematics are used maybe in JJOS and Aksysy, but not exactly sure how the implementation is, but its a 4 poles total over 2 filters. I think JJOSXL he split it so its, 3 poles for first and one pole for second, not sure. Maybe just 2 poles each as original aksys.
But the have an inherent curve to the filter. Thats how filters work in reality. So what your asking for is already in there.