Hmmm I have 5 'programs' (or at least I can cycle through five different beep tones...) I only usually use the first 2... 'regular volume/every day listening' and the T-Coil. I've no idea what the others do. They all sound the same to me.
I have three. Regular, fan suppression, and t-coil. I got frustrated with the fan suppression mode, so now I listen to TV and computer with an audio cable and neckloop. The audio cable is so long I could take a nap or sit on the toilet while listening.