> > A very simple parametric curve is > y = (1 - x) / (1 + a*x) > With a = 0, you get a line thru 0,1 and 1,0 > With increasing a, you bend the line to almost a sharp angle.
Hello Stefan. Indeed, that's a simple parametric, but for generating envelopes we have the freedom to depend on the previous sample's output. So, while an exponential curve parametric-style requires a pow(), the iterative solution is simply current = previous * multiplier. Adding a range of curves can be done by adding a delta, as Andre/Werner and I have independently discovered (along with probably many others). And "current = previous * multiplier + delta" is going to be fewer calculations than a parametric formula such as yours. So I suggest the Andre/Werner/my method seems faster for the specific application of envelopes, as well as offering true exponential curves. My synthesizer is a programming language, not a graphic synth, and includes curve and s-curve functions that are parametric, and indeed use the exact function you mention! http://moselle-synth.com/ Thanks, Frank
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