Want to connect my electric guitar with passive pickups to "guitar" input and connect acoustic with L. R. Baggs Lyric pickup to another input so that I can use Helix as A/B depending on which preset I choose. Problem is I can't seem to get enough input signal to Helix from my acoustic. Pickup, battery and cables are all good. I've tried all inputs. Do I need an external preamp or DI to do this? Helix is out to L2t via Link 6.