Struggling with alto ts210

[twystedriffs]

So when I bought my helix comma I rent at the way I knew how and what the equipment I had. Stereo power blocks with two 4*12 cabinets. I knew I was missing a lot of the Helix with the cabinets and IRs and such. But it sounded really damn good. So a week or two ago I started doing some recording and adding cabinets in my chain and everything sounded amazing through my studio monitors I was hooked. So I ordered an alto ts210, and just plugged it up. Even if I just start a brand new patch put in an amp with a cab and nothing else, everything sounds really muddy and bad. I kept my studio monitors on at 11 a.m. just to give me some of the stereo spread I am used to, but the sound quality is still the same. I've tried high and low cuts on the cabinets but everything sounds terrible to me. I'm very frustrated period should I run left and right quarter inches into both inputs of the alto speaker? Or just the left mono? I turn the guitar pad on and then running line out. Maybe it's just adjusting my ear, but if it sounds like this I will go back to my apps and cabs, I just can't seem to get a good starting spot on hardly any of these ant models they all have the same muddy harshness. Any help would be great exclamation point I am a 20-year Line 6 veteran, so I know what I'm doing. It just seems this thing should sound a little better without massive tweaking, I feel I am missing something. I have the alto volume at 12 as full volume has alot of hiss..