Yes, Helix has actual models of Vox and Vox-styled amps, but this is for situation where i'm using it just for effects and to control my tube amp via 4cm.
Last night i tried to do this using actual amp models. i got close, but not 100% satisfied like i'd be with a Wampler Ace 30 or other AIAB pedal (which i'd rather not have to add to my setup). I tried placing the amp model both before and after my amp's effects loop in effort take my amp's preamp out of the equation as much as possible, which of course you never really can w/4cm as my guitar signal is always going to hit the amp's preamp. anyway, i ran out of time and went to bed.
Now sitting here at work i'm thinking maybe i could try achieving this tone, specifically that chimey-edge of breakup, via one of the distortion/OD blocks? Has anyone tried this? If so, which models should i try first? I'm thinking Timah and Tone Sovereign might be good starting points but figured i'd see if/how anyone else has been able to pull this specific tone off.