Connect the Pin 7 harness in Hexpander-only installations so that mag and acoustic are available on the 13-pin connector. Note this requires the addition of an acoustic volume pot, or you can omit the pot and get acoustic out at full volume all the time by connecting the yellow and orange wires together. The QuickSwitch plugged into the Hexpander will control these signals on the 13-pin, but not on the 1/4" jack. To get mag-only on the 13-pin, just don't hook up the yellow and orange wires. To get acoustic-only on the 13-pin, just don't hook up the mags. A suitable place to connect the green wire to the mag pickup system is at the 1/4" jack.