Graph Tech Ghost - Manual (Page 20)

20
The 9v battery that powers the Acousti-Phonic may require
some routing to fit it inside your guitar. Consider these possible
locations for the battery: the side wall of the cavity, the back
wall behind the pots, or stuck to the control cavity cover plate.
The Hexpander does not require a 9v battery because it will
get power from the MIDI converter through the 13-pin jack.
Acousti-Phonic & 9v battery
9 V
OL
T
9 VOLT
Front Wall Side Wall Cover Plate