fixes: + Fixed issue with pitch bend not returning to centre

IMPORTANT NOTES: The pitch and mod stick will need to be re-calibrated after installing the OS.

To update the OS please follow the instructions here - http://www.novationmusic.com/answerbase/en/article.php?id=552

To re-calibrate the pitch/mod stick please follow the instructions here - http://www.novationmusic.com/answerbase/en/article.php?id=551