I am running a Windows 10 machine with MMTTY 1.68 under N1MM version 1.0.5327.0. Stand alone MMTTY keys the rig fine. Under N1MM, pressing a function key such as my call sign, it takes about 10 seconds to go from a steady tone to Mark/Space tones. To exit transmit I have to press ESC. Exiting N1MM doesn't close MMTTY I must use Ctrl + Alt + Del. I am using a real serial card to a Rig Blaster then to a 756 Pro III.