Thanks for your answer. I have downloaded and read the manual for both the Mod & Time Factors and they do say they are "independent", but I've actually been burned with this in the past and had units that sum the inputs (even when both L&R inputs and outputs are used), so the overdrive that's meant to only go to my AC30 ends up in my Hiwatt too and the subtle distortion that's destined for my Hiwatt farts all over my Vox.
Not what I'm after. I wonder if anyone can verify this for me? By running different sounds into the unit (doesn't have to be overdrive) and see if they come out in distinctly different channels at the output.
That would be great if possible.