I want to be able to switch during a set between my Pederson ns2 hollow body w/Duncan 59s and piezo And sfg rosebud. At this point the eq is so off. The rosebud sounds killer but the pederdon is just too quiet and not cutting through like the bud even when I turn up the preamp. I'm thinking of installing the buffer but I'm wondering if anyone has done this with a true hollobody ? Already , if I'm not muting strings for a second I get feedback. It's just not cutting through like the rosebud. I just don't want to do the buffer and lose control. Also , I already have the piezo , so can I use that battery to supply power to the piezo and the buffer and will the piezo be to hot/bright buffered ? I'm not doing this work myself . I'll leave it to the pros . I just want to know what I need when I bring it to my tech.
Not sure if "turning up the preamp" refers to onboard the guitar or amp? Either way with a hollow body this is without a doubt the reason for your feedback issues. Adding the TPC1, unity or non, will not change the EQ nor the feedback issues you are experiencing with your current setup. The buffer gives what it gets, so if the guitar is feeding back you are just going to open up the high end and get feedback with more clarity. Taking a guess at possible remedies, i would replace any pickup height adjustment springs with some rubber type. Next i would try and raise the pickups, this will substantially increase volume. I would also try increasing the amp volume versus the preamp volume. Just a couple things to start or look into with just the basics of your rig. I always try and workout the clean tone first.