New answers tagged winforms
Given the fact that the keyboard isn't an option, I would leave all the channels visible as they are now. Hiding them into a scrollable dropdown-menu/spinner will increase the interactions and the time needed to search, find and select a number. I strongly suggest you to change the layout of the matrix to 10*10 instead of the current 20*5: a layout coherent ...
Typing is the fastest way to enter the information. There is nothing wrong with letting the user type in the values, provided you have appropriate validation on the field. (If the value being entered was something approximate, I might have suggested a slider, but that would be too fiddly for selecting precise values such as frequencies.)
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