I was doing the same thing and ended up getting the full Helix Floor plus a mixer.
Then I started researching how to use wet and dry because of the limit of splitting once per signal processor.
I found a novel and easy way to handle for anyone with peddles.....................and A/B/Y splitter peddle.
I now got
1. Guitar in A/B/Y Splitter
2. Rocksmith Cable on path A
3. Peddles, Helix, what ever to path B
4. I then use the mixer to recombine the Rocksmith audio with my Helix
I take it a step further because I want to use my existing Marantz receiver
1. I set the speakers up so Zone 2 does not use the amp
2. Zone 2 is set to the Xbox/PC
3. Plug Zone 2 Mixer In 1
4. Plug Helix to Mixer In 2
5. Out of Mixer to Stereo in for Zone 1 (CD)
6. I set the volume of Zone 2 to max.
7. I turn the in-game mixer so that Guitar and Bass are at Zero
With the mixer I can control how loud my Guitar is.