I've used this preamp with all of my basses, but with my new acoustic bass I need a blending preamp with a mic input. This is great for switching between instruments or for blending pickups. It has an impedance switch for using piezos. Fabulous preamp. Great outboard pre for passive instruments as well. This is in great condition. Works 100% as it should. Comes with a power supply (15v). Velcro on the bottom. For sale only. No trade offers please. $190 shipped in the Con US. Thanks so much!