Improved version of the Void reverb.

Changes:

• Skew parameter
• Stereo & Surround (quad) version, with 4 uncorrelated channels

2 patches + 2 encapsulated classes.

Unpack, open.

• proper use of Cascading Replicator
• Skew (allpass delay values generated using 3 simple parabola functions. Skew flattens or inverses the parabolas)
• 2 and 4-channel versions
• additional High pass filter in the cross-feedback