I'm not a huge fan of push/pull pots. If I need a pot and a switch, I'll wire them separately. I had a bad encounter with one once. I was playing a show and I heard the pre-amp battery starting to die and had the A/P switch on a push/pull volume pot. I reached down to 'pull' the pot to passive, and found a volume knob in my hand that was now not connected to anything. Meanwhile, the action of the knob pulling off had raised the volume of the bass guitar so the sounds of pre-amp death were now blaring over the PA. A beautiful disaster it was. All my basses now have a separate A/P switch, and on the bass I'm building now, it will be illuminated.