Hi, I know that this parameter is for changing the instrument timbre, but I really don’t understand exactly for what kind of situation I have to use it. I see that there is a lot of “presets” to choose from. Please help me.

Hi, it depends to the music you are playing or composing for. These instruments are not presets but they are instruments structurally different each other (metal, reed, tube etc.) so that you can use these several timbre in your music (from the classic music to jazz, from ethnic to rock). They are very useful if you want to create a realistic sax (or woodwinds) ensemble changing instrument for every sax player.