As the title says, my microbrutes octave down button sometimes doesn't work. The up button appears to work fine and you can shift up octaves as fast as you like but the octave down button is unresponsive. sometimes also if you hold the octave down button for a shot time the octave changes down. Its like the button press for the octave down button is picked up less quickly than the octave up button. Anyone else found this or is it just me?