If you are in a need to clear you settings completely, you can do this be deleting the user.config file.
This will cause all your settings to be reset back to the default settings.
(Favorites and presets are not affected)
The file is located in
C:\Users\<YOUR-LOGIN-NAME>\AppData\Local\Bassic_Technologies\OnlineRadioTuner.exe_StrongName_35sngzagvlze2z1z5wk20edgufcu43yc\x.x.x.x
If you are running Windows Vista, or at
C:\Documents and Settings\<YOUR-LOGIN-NAME>\Local Settings\Application Data\Bassic_Technologies\OnlineRadioTuner.exe_StrongName_35sngzagvlze2z1z5wk20edgufcu43yc\x.x.x.x
If you are on Windows XP.
(Replace the x.x.x.x with your latest, currnet version, for example 2.0.4.0)
If you don't see those folder, enable to see all hidden files in Folder Options for the Explorer.
Delete the user.config file.