
This patch augments the enhanced 4ch panner used in “MIAP~_quad_decorr”, adding a wet/dry plate reverb (ala yafr2) mixer via the outer ring of speaker nodes.

The inner 4 speaker nodes pass signal straight to the DAC. 

The outer ring of speaker and virtual nodes passes through a plate reverb and then sends signal to the same DAC channel as would occur when moving near the inner ring.

For Map A, signal from the center speaker is decorrelated using a slightly simplified method based on [1]. For Map B, the center node is a silent node (so one can fade out both wet and dry mixes).

[1] M. Bouéri and C. Kyirakakis. “Audio Signal Decorrelation Based on a Critical Band Approach,” in 117th Convention of the Audio Engineering Society, 2004, pp. 28-31.
