Which is better to use?- a dual concentric pot or a push pull pot? I'm planning to install a volume pot for this piezo system in my other guitar. I don't want to drill holes for another tone pot so I went surfing the net for options. It was from net surfing that I found this thing about dual concentric pots. It's the first time I've seen or heard it. Anyone know how it works? (ie. when you turn the knob, do you activate both volume and tone or do u have to pull it so that before you pull the pot you activate the volume then after you pull the pot, you activate the tone with the volume? (is there even such a thing?)). Also, is it different than what people call a "blend pot" or concentric pot or are they all the same thing?

Also, what would be a good equalizer that I can add in the guitar that will compliment a graphtech piezo system?