Hi folks, I'm wanting to upgrade the electronics in my Corvette Standard. I've decided on EMG-Js for the pickups (J + LJ). If I go with an EMG preamp it'll be the BTC, since it would basically drop in. I really like the specs of the U-Retro preamp, though. I have some questions about it: - Will the U-Retro complement the EMG pickups well? i.e. are there any impedance issues or such. - If I install it with EMGs, will I need two batteries? Electrically, the U-retro and EMG will run just fine off of one 9-volt, but that's like double the power draw so battery life is a concern. - Are the pickup/passive switches still separate toggles on the U-retro? - The U-retro's midrange control has a really wide sweep, is it difficult to zero in? There's nobody around that has a bass with a J- or U-retro, so I can't just play it and see for myself. Thanks in advance for your help!