Hey @dantheprophet I use my helix floor for my bass rigs and have had nothing short of amazing tones!
I go from my bass (77 Ripper) into the helix. I don't use a preamp I use a full bass amp (no cabinet...yet).
Lately I've been using the SVT 4PRO. I set up my compression, pitch shifting and volume pedal before the amp, then the amp, some reverb and delays after and a little compression.
After that my signal chain splits, one split goes to my 1/4 inch outs, this I feed to the effects return input on my GK1001 rb which powers my 410 on stage cab! The GK acts as my power amp only and I don't find it to color my tone much at all. my stage sound is punchy as hell and moves plenty of air.
The other split in my chain heads through the Rhino 610 cab in helix and out my XLR to FOH.
Let me know if you have any questions!