Phasor doesn't play nice with negative frequencies

[v7b1]

The setFreq method of the Phasor class accepts negative values, which is nice cause it would allow the phasor to run in reverse (ramp down).
But the Process() routine clips negative phase values to zero instead of wrapping to the maximum value.

Should probably be something like:

if(phs_ < 0.0f) { phs_ += TWOPI_F; // phs_ = 0.0f; }