I'm trying to understand inputs. I have an electric bass guitar that I'm running into a UCA202. The bass is passive and I don't have a pre-amp. Going from the UCA202 to my DAW (Logic Pro), the bass sounds okay. I also have an acoustic violin. It has a piezo contact pickup that is clamped to the bridge. I'm running that into the same UCA202 and DAW. It sounds weak and thin. I was told that I have an impedance mismatch and should run through a mixing board or pre-amp. I will do that but I don't understand the problem that I'm addressing. I've googled on the term and read a few pages but they're not making sense to me. I'd appreciate pointers to any really basic sources that I can read and learn from.