Can I Enable/Disable SA, WTA and Ch. A or B on the WTR-680 BP?SA = Stage announce WTA = Wireless Talk around CH-A / B = the intercom talk channels

Yes, these audio buttons on the WTR beltpack can be customized as needed.  Open up the small cover on the rear of the WTR beltpacks to expose the setup LCD display and the menu / set buttons.
To setup the SA button, press and hold the (Set) button and press the (SA) button to show the SA enable disable screen.  Press the (SA) button again to toggle the display from ON to OFF or back.  Release the (Set) button to accept the the current displayed setting and return to the group/channel screen.
To setup the WTA button, press and hold the (Set) button and press the (WTA) button to show the WTA enable disable screen.  Press the (WTA) button again to toggle the display from ON to OFF or to Lon (latch on) or back.  Release the (Set) button to accept the the current displayed setting and return to the group/channel screen.
To setup the Channel button, press and hold the (Set) button and press the (Chan) button to show the channle enable disable screen.  Press the (Chan) button again to toggle the display from Ab on to B on to A on and back to Ab on.  Release the (Set) button to accept the the current displayed setting and return to the group/channel screen.
The Talk button can also be set to Latch on or Latch off.  To setup the TALK button, press and hold the (Set) button and press the (TALK) button to show the Talk latch enable disable screen.  Press the (TALK) button again to toggle the display from TL ON to TL OFF or back.  Release the (Set) button to accept the the current displayed setting and return to the group/channel screen.