I can get nice clean tones but as soon as I add an od block or a use a high gain amp, the tone gets boxy and kind of muffled.
I did tweak quite a bit, added eq blocks, high cut, low cut, parallel cabs, followed the good advices here on the forum but I am still not happy with the combo od tones + mackie cr4. So, assuming that the cr4 are the weak point of the system, moving to nicer monitors or to a PA speaker should help.
At least I hope so because I have recently spent more time tweaking than actual playing and I am starting to ask myself why I spent all this time with the helix instead of playing my tubes amps which sound so much better and are way more plug and play.