I recently picked up a D-tar Mama Bear, which is an emulation device meant to simplify and improve the sound of various acoustic guitar pickups. I am just now toying with it, and have no opinion yet, although they are liked by many guitar players, and are used to add some air and realistic guitar sounds, and remove quack. The device is for those using only guitar pickups in recording or live settings. In any event, it has a phase switch. However, my thinking is that phase issues are a continuum, meaning that two devices (say the guitar and amp in this case) could be perfectly in phase (depending on location of the two devices of course) perfectly out of phase, but more importantly, somewhere in between. Now I am wondering about this in between phase. It seems to me that there are theoretical locations where the phase switch will not help phase issues. If this thinking is right, why would the manufacturer's (yes, I have seen other kinds of devices with just a simple phase switch) not make a continuously variable phase control? Any other thoughts on the value of the simple phase switch would be welcome.