I see what u mean... it is a 'RECORDING OUT' jack which in theory would have very little natural volume and would need to be sent into another amp head or powered PA head/board. I will try this at my next gig..... I used the Tritube 75 for my last 2 gigs, and while the chorusy cleans were awesome I felt the overdrives [Alex patch and Blackened patch] really getting lost in the mix.....
Will let u know how that plays out.
As MJMP says, the recording out will be line level designed to go into a poweramp > speaker or into a desk/PA, question is is the recording out cab simulated, coz if it's not cab simulated (MP2s have cab sim outs), then you need poweramp > guitar speaker, if it is, you need desk/PA or pweramp > PA speaker. Since this is pretty much an MP2 mounted in a combo set up ?.... The record out(s is there 1 or 2 ?) are likely to be cab simulated, that said it's easy to find out, if when you pug it through desk/PA it sounds way too bright/toppy it's not been cab sim'd and better to go power amp > guitar cab (if it sounds a bit dull no tops through guitar cabs, then it's probably cab sim'd).
To cut through a live mix, try adding presence (it's a 6khz boost), and also, if your MP2 has the room eq knob ? turn up for more mids and cut, turn down to sound bassy, this control changes the sound quite a bit, helps (designed to) adapt to different stage acoustics e.g. live surfaces, toppy, lots of polished things (turn down), to muffled carpeted/sound proofed (turn up)