It's only when you push the air search button that you switch between 8,33 and 12,5 for the air band search. It's an old school scanner with fixed channels numbers that are more easy to understand than the modern DMA scanners.
Push the MAN button and then 1 and MAN again to go to the first channel. Turn the VFO dial to step through the channels and see what are programmed to them. If only the frequency change and not the channel number when the VFO are turned, then change mode by pushing the VFO dial. If you have Ch1 selected, enter the frequency and hit E. Then MENU and select CHANNEL DATA and E. Scroll through the different options and edit them and go back one step at a time with MENU. Alpha tags are selected with the VFO dial and the position on the display change by the arrow up(hold) and down(limit) buttons.
There's 10 banks with a hundred channels in each. The different banks are toggled on and off while scanning by pushing the corresponding digit.
There's no trunking in UBC785 as the memory for that have been used to increase the channels to 1000 instead of 500 in the UBC780 that has analog trunking.
/Ubbe