tweak Basic demo

demo-Basic.html

@@ -25,8 +25,9 @@ window.onload = function () {
 			var note = 50; // the MIDI note
 			var velocity = 127; // how hard the note hits
 			// play the note
+			MIDI.setVolume(0, 127);
 			MIDI.noteOn(0, note, velocity, delay);
-			MIDI.noteOff(0, note, delay+0.01);
+			MIDI.noteOff(0, note, delay + 0.75);
 		}
 	});
 };