Hi gang. I build guitars & basses (and mandolins bouzoukis and other stuff) I've made several electric guitars with piezo bridges which give a fairly decent scoustic guitar sound. I run these to seperate jack sockets on the guitar so that two cables run to seperate effects untis before combining into the amp. I've just started a fretless 5 string bass andI have a magnetic pup for it and have my eye on a piezo bridge for it too....... I have seen guitars with internal blend circuits, such as Artec's MB1 at the cheap end of the market. I've found this preamp circuit which I'm told with smooth the impedence missmatch between the piezo & mag if I use two of 'em and then blend them with a regular 3 position pup switch...... but then I was told the input is fine for a mag pup, but I'd need higher impedance for the piezo. so, any suggestions? I'm guessing I'd need to change the 1K resistor leading to leg 2 of the op amp..... I KNOW that the components and all the other gubbins will likely come close to the £50 or so that the Artec kit costs, but I'm interested if there is a simple way to do it dirt cheap. I LIKE dirt cheap!!