@ bitsnbytes:
If you use BeSplit, be aware that the audio is not normalized, so you have to turn up the volume. But in principle, it should not matter
Using BeSplit is fine (do it also sometimes), but the correct channel ordering for this method (i.e. the Pentagon-rig with Emigrator) is as follows:
channel 1 = Center
channel 2 = Front Left
Channel 3 = Surround Left
Channel 4 = Surround Right
Channel 5 = Front Right
Channel 6 = LFE -empty
Andreas