Greg, I never change the switch from mono, my tuner is always on and connected to AC power. The other mono send from the DS-5 goes to the Avalon U5 I use to send my bass to FOH. When I want to tune I mute the U5 signal to FOH. With the old style DS-5 my tuner was in the signal chain between my bass and the U5. I prefer as uncluttered a signal chain as possible, that is a big reason I prefer the new DS-5. If I want to tune using the bridge pickup I use the pickup selector.