Hi,
I'm afraid the vfo control is not ideal from an accessibility point of view and I am working to improve it. For now it takes 10 characters to set the frequency in hertz. When you first tab into the control typing 0003800000 will tune to 3.8Mhz , this will move the cursor to the right, using the left arrow key repeatedly will get you back to the start point.
I have made some more accessibility improvements for the next version, the drop down lists now read the proper text. I discovered Avalonia ( the graphics toolkit I use) was not sending further help text to screen readers, the Avalonia project has accepted fixes I made for this so thing should improve with the next release of Avalonia.
73 Alan M0NNB