revamp of the filter effect based on Bequad filters
Reworked the LogPotmeter to bend the desired range to a 0 ... -40 db scale
Swaped HPL and LPF
Limit q to ~4 for in case of overlapping, before it was up to 16 (4²).
Avoid recalculation filters when Q is clamped
Fix issue with filter activation and corner frequencies.
Added EngineFilterMoogLadder4
Added sceleton of MoogLadder4Effect
First verion from http://musicdsp.org Antti Houvilainen Moog
Deal with sample rate
added a gain correction for smooth enabling the filters without a gain drop
make moog highpass working
moog highpass works
enable oversampling for HP
move coef calculation to setParameter()
first step towards double tanhf remove
added postGain for HPF
make m_azx local
Moog filter stereo
Use tanh approximation