Change mix control to separate dry level control
smooth controls per sample not block
change decimate index
fix lpf and hpf transformations
make integration sampling rate independent
set mid default level to 1.0
simplify tone controls
remove fake stereo feature
README: update project description
Use lpf to smooth feedback amount
Fix fb* not being between 0 and 1
Implement wide aka stereo guitar doubler
Fix integrator gain difference
Replace feedback mechanism with integration