Welcome! As @the other John Browne pinged me, I am the ultimate fanboy. Here are some JC-120 cleans below.
Start with shape 0 in classic mode, lower bass and boost mids/treble. Also no mid-cut or raising of deep. That works for me... but I can maybe make a vid going through the settings. Also red channel can be used for chug chug as well and not just lead. The VHX loves OD pedals in the Pre-loop. @Leo Diezel said Modern is more in Mesa territory so experiment. Once you go to shape 1 and 2, things get REAL boomy and you need an OD or to cut lows.
Report back some settings and I'll post some soon here.
JC-120 wanna be tone: