Smoother behavior

[jpcima]

Some requests regarding the smoothers.

1. the linear smoother does not reach the final value, it just remains up to one dy below. This behavior is not necessarily to be considered a bug, but is a bit counter-intuitive.

2. it's desired to have a setter for T _current for allowing to set the current smooth value. Other frameworks have this. It's to ensure that a smoother can take the direct value right away on start. (in particular for synth, for example when keying a new voice)

[p0nce]

1. Not sure if easy to fix (EDIT: aaaah, perhaps)
2. Absolutely, what I prefer even is to make things auto-initialize, that is the first nextBuffer takes the first input as current value.

[p0nce]

I don't find the smoothers very good, what would you say of removing them? I feel like anyone can build better ones, and the linear smoother isn't very useful either.

[jpcima]

It's your choice, personnally it's a nice thing to have these readily available in the framework.

I notice how LinearSmoother can be slightly simplified. If phase decrements toward zero, the firstNextAfterInit can then be eliminated, and period will have the possibility to be dynamically changed.

        _phase -= _sampleRateInv;
        if (_phase < 0)
            _phase = _period;

[p0nce]

Smoothers deprecated, one can copy them in own tree to fix them.