Thanks for your answer.
The only thing that I want when I control DI with volume pedal is when I want to (I do not know if I could describe it well as English is not my native language) make a fade in to the guitars. I can do it well with the wet signal so its fade in is when and how I want it. So I suppose the same will be with the dry signal and so it will not require further edit in DAW after reamping.
Also I'd like to ask how to connect my Kemper analog to the UAP Apollo Firewire. I am thinking that if I use xlr to xlr the signal will flow through two preamp stages one from the Kemper and one from my Apollo. Am I right or this is wrong?
Is it ok to connect it with unbalanced cables from 1/4 ts outputs to Apollo's line in or I have to go through Hi-Z input? According to Apollo's manual the line inputs are TRS but it could handle TS cables too.
Or maybe I have to buy an XLR to TRS cable and connect the XLR outputs of Kemper to line inputs of Apollo?
As far as I understand the main Kemper outputs (XLR and 1/4 TS) are both line level but I am not sure for that.