Variable tanh() for saturation

[MrBeagleton]

Removed

[Christian Schüler]

Here's another one I find even more useful. This may be everyday knowledge: (1/a)*tanh(ax) with a>0 produces a variable-ceiling tanh curve.

Yeah, that is exactly what I use in AriesVerb to implement variable strength saturation. To be precise, its b/a*tanh(ax), where b is the 'overunity' parameter. However I don't use tanh directly but a rational approximation of tanh, see http://www.musicdsp.org/archive.php?classid=5#238. Can also be done branchless with min/max instructions.