Thanks for your answers. OK I should define such functions so that the image of
the function is in [0,1] for best/predictable results.

clipka:
> The function result is always "folded" into the [0..1] range; the exact
> algorithm depends on the waveform (ramp_wave being the default).

Ok thanks for that information, I was wondering how it decides what color to
give for values outside that range, to be honest I don't quite understand your
answer but it's enough for now.

The manual is a treasure trove I shall spend more time reading it.

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