I'd like to add some organic woody tone to the possibilities of my P bass. I love the sound of the pickup but when I put my ear on the body of this bass i hear beautiful harmonics that are very reminiscent of an upright bass and that the electro magnetic pickups don't give. Can a piezo system be added to my bass? If so what's the best way to go? Ideally I'd love to be able to adjust volume levels freely. Tone as well.