We have investigated the surround handling in Logic. The problem is that Logic is sending wrong configurations to the VEPro AU Plugin. Logic can even request configurations that the plugin reportedly does not support, which is a breach of the AU specification from Logics side. We have tried to create several workarounds for this, without success. We are awaiting reply from Apple developers on how to proceed in this matter.
So for now, when using Logic and using a 5.1 or 6.1 surround setup, the VEPro plugin will be initialized as 5.0 or 6.0 respectively. However, since the LFE channel should never be used for music mixing, it should not be much of an issue. Hopefully Apple gets around to solving this bug as soon as possible.