When I try to transmit with MMTTY in DX4WIN, my rig goes to transmit, but I get the error message: "An exception occured - i.e. _Open - device already open" I am not running MMTTY stand alone or any other program but DX4WIN. When I close DX4WIN and bring up MMTTY stand alone, MMTTY works fine. Any thoughts? 73, Dave, K7JJ Dave Earnest k7jj at arrl.net