[LAD] Ambisonic Effect processing

Hi everyone, I'm currently thinking about how to process B-format ambisonic signals. For basic compression, gating, expanding, limiting etc things are relatively simple: process all 4 of the W,X,Y and Z signals. But what bout effects like Reverb: Should that effect only be applied to the W signal? This will change the signal's direction due to the unrelated-ness between the signals. But appling reverb to the directional components will smear any sudden changes in location, or am I missing something here? I'm applying most effects in mono before doing the B-format encode, perhaps all effects like reverb should be placed before that encoding? Open to theory, experience, guesstimates etc :) -Harry