Hello Tebasuna and ACrowley
VST Cicle Surround II, works the channels discretes.
Dolby Surround EX-(6.1) the channel SC, has to be a channel Matrix, not discrete.
My Encoder
DTS Pro Series or DTS HD Master Audio, it allows, the channel Matrix or discrete.
I am, trying to create a new method 6.1, with Cubase 4 and Sony Sound Forge 9, but, I still have much that to be employed at this. When some day obtains it, I promise to do another guide