Right, fresh back from the keyboard . . . Not mono. You can play a fistful of notes, chords (not that you'd play any more than one note at a time with a trumpet, anyway), and the effect is there. Plus, all the notes in the 'chord' tail-up. At least I now know what controls it, light key pressure. Thing is I don't use trumpets much, so it's a bit moot, really. Could come in handy at some point no doubt.