Presently, I've got a K&K mounted inside my mandolin that I run through a Boss bass inline 10 band graphic eq ahead of the DI and behind a stomp tuner. GREAT sound. I pull the highest band all the way out and use the other 9 to balance the sound. Volume @ 5

My 6 string guitar is an old Alvarez w/an L.R. Baggs stripped from a Seagull. It's a great PU. Volume w/a 3 band eq and tone shaping. A soundhole plate holds down the feedback and I ease up on the treble. Most acoustic players like to hear that 'ringing' sound like they hear it in their living rooms, but in a performance situation it fatigues the audiences' ears.

12 String is a 'Lawsuit Era' all mahoghany Takamime w/t stock Tak pick-up. Just treble/bass/volume and it still sounds great after 30+ years. A soundhole plate as well. Not the rubberized ones, but the hard plastic ones that have plastic clips that fit under the soundboard and grip the top. Don't know the maker.

My autoharp will be equipped w/a K&K like my mandolin, but probably not run through an eq unless needed, though it will definately have some sort of tuner, either onboard or inline.