Hi, no the MIDI reset does not fix the problem when the notes hang, I can see all the MIDI lights light up when pressed but the notes still hang. This problem must be something definitely wrong as I only need to play 2 - 3 cords and it does it so its not very intermittent, I am going to try a USB hub as you suggested today and see if that helps as the Mac has USB 3 but says its is completely compatible with USB 2, thanks again for your help. Regards.