It's just a way to save on processing power that's all. It means you don't end up with 7 or 8 instances of the overdrive/amp/speaker simulation effects chain. You just have it all on one dedicated track. Reaper seems a lot less cpu intensive than Ableton though so perhaps it's not necessary any more.
I think I've tried every routing option available but, if I can I'll make a little video of what I'm doing in the next couple of days to post here in case I'm missing something.
Thanks again for your help though!
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