@TBurst Std @Ozopart Just to further clarify, the Helix has two processors and each of the two "paths" is connected to one processor. It’s intended to allow you to better allocate DSP. It seems limiting but it does have a purpose. You can also split each "path" into two "rows" and effectively have four "rows." Like, for example, if you wanted to run two different amps or effects parallel to each other.
The "paths" run parallel to one another. This means you can feed the first "path" into the second "path" and allocate different blocks based on how much DSP they hog. This can limit what you can do with one signal chain, as the "paths" need to go one into the other. You can’t send the signal of the first "path" into the second "path" and then send that signal back out into the first "path" again.
You can also run two different instruments (or vocals) on the two different "paths."
The pitch shifting/whammy/capo/octave effects blocks that (usually) go in the beginning of the chain, and the really big complex reverbs and delays that (usually) come towards the end both hog up a lot of DSP. As do a few of the amp models (I have a lot of trouble making a signal chain with the Mesa Boogie Mark IV and Soldano SLO models personally). So if you have a Whammy on the beginning of the first "path" and some really lush shimmer effect towards the end of the second "path" you’re already pretty limited in what you can put between them.
The notion of running other independent pedals with modelers is really a lot more essential than people make it out to be. I don’t think any of them are really the be all end all "everything in one unit" we’ve been led to believe. If you’re a Helix owner who likes having a super complex signal chain, I actually recommend biting the bullet and saving up for a DigiTech Whammy DT and/or a Strymon BigSky (among other pedals) to run independently in the Helix’s effects loop. After that you should be able to do whatever you want that the Helix has to offer without having to worry about DSP (unless you absolutely need to use the Soldano).
I don’t have any Fractal experience so I’m not sure how processing and DSP allocation works on AxeFX.
I’ve kind of come into the mindset that the helix is really just amp models and cab models/IRs and everything else is just there if you really need it, but to really increase versatility, you should still buy yourself other pedals to use independently in the effects loop if you use them a lot.