What's wrong with this asymmetric distortion algo?

Hey all, I'm working on a JS amp and am trying out different types of distortion. However, this one I cant seem to figure out how to implement (probably because I don't have sufficient math skills) - it's the dash-dotted line I'm after: The part that gives me problems is (obviously) the first function, I did it like this: Code:

I've managed to create the spike, by using +0.08905 in the range limits instead of -0.08905. Is this the cause?

It's hard to see in your plot, Jonas, but it seems the spike occurs somewhere above -0.09, where the second sub-function is to be used. The function is composed of three sub-functions, each valid within its respective range: -1 <= to < -0.08905 -0.08905 <= to < 0.320018 0.320018 <= to <= 1 What you code seem correct, but it is only valid for the first range and so that it has a spike outside that range is really unimportant; in that region where the spike is the second sub-function is valid, the other two not. So your code should look something like (not JS code obviously) Code:

Yes I can see the small spike when I zoom in on my plot. But the spike goes away if use -0.01 at the end of the first expression. I think there's a sign error in the original expression. Hopefully the maths makes sense. I don't know how to program in JS. Pete

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