extend mapping shape

[Oeyvind]

The mapping shape in MIDIator can currently be adjusted from log-like through linear, to exp-like. One could imagine extending the shape mapping so that more extreme settings of log-like shaping would flatten out and limit the shape Then, by going further than this value, making the tail end curl back again like this:

This way, one could have a mapping that is most effective when the input is in the middle range, and less so on input minimum and maximum.

The same technique can be used to shape the signal conversely, i.e. like this:

This would probably break the precise log or exp shapes, some experimentation needed to fine tune the exact shapes, and how to get e.g. a log shape.