I just got an Epi Masterbilt and it comes with the eSonic2 preamp that uses their fingerboard mag coupled with their under-saddle transducer. I want to add the Lyric mic to the mix as well for a 3 part system. I was hoping to keep both the Lyric and the eSonic2 system on their own preamps but somehow join them together at the endpin jack output. I could use the eSonic2's preamp to EQ/mix the Epiphone pickups, the Lyric's separate preamp to EQ the Lyric, and then use the volume adjust of both to mix the two systems together.

Is this possible? I've been trying to find info on the Lyric's second channel, but I can't find it anywhere.

FYI, I'm not afraid to solder.