mekanics

Hi, I have an used dbx166XL, which I would like to use as the first effect in a chain (before stomp) There seems to be no possibility to configure FX loop this early in the chain. Can I connect dbx to the guitar and after that to X3 Pro? I believe signal levels do not match, so do I need some kind of equipment between guitar and dbx? How to connect then the dbx to X3 Pro? Do I need again some extra hardware, or can I use normal front panel guitar jack, digital inputs on the back panel etc...? My second question is, that is it possible to chain tone1 and tone2? By this I mean, can I connect guitar e.g. as a guitar 1, create signal chain (=tone 1) for it and then use this tone 1 as an input for tone 2? I am not sure are there such option in input and output configurations menus. Could this be done e.g. leading an output via cable to e.g. digital input and configuring tone2 to use that input? If this is possible, one could use FX loop (and dbx in it) in tone1 without any other effects and lead this FX-looped tone 1 to tone2 as an input?