Hello, I've been soldering my own instrument cables for a while to moderate success. Grabbed some thinner mogami cable and plugs from Voodoo Labs and am looking to start a custom power cable set up on my pedalboard. Had some quick questions about soldering when it comes to polarity... for center positive polarity (pedals like pro co rat, etc)... do I solder [tip <--> ground, sleeve <--> center conductor] on one end and then [tip <--> center conductor, sleeve <--> ground] on the other end? How do I know which end should go into the pedal and which should go into the power supply? OR, is it simply the opposite of center negative polarity as such [tip <--> ground, sleeve <--> center conductor] on BOTH ends? Hope that question makes sense... Second question is in regards to making a dual 9v (or 12v) to single 18v (or 24v) power cable for certain electro harmonix pedals. Do I just make two seperate 9v dc cables on one end and then join them with solder to the final 18v/24v end in unison? Is there something I'm missing one this one? I just want to make sure that I don't blow up any of my pedals as I've never soldered power cables before. Thanks!!!!!!