ey yi yi I was seeing 1/4", and thinking it was the same input as on the analog board. I got it now. geez I'm dense! So it's just my Taylor 526E Exp. 2 pickup via 1/4" chord into the DL1608 channel 16. Yup - it's padded down to accomodate a keyboard input, not a low output piezo like my Taylor. This seems like a weird choice on Mackie's part, probably causing a bunch of guys like me thinking the same thing: on the analog board I can plug in keyboards, drum machines, AND acoustics. OK I have it now - thanks for the quick replies!