Am trying to get FT-8 working via my Kenwood TS-590SG, with a USB connection to my mid-2015 MacBook Pro. I've got WSJTX configured so CAT control works fine and the Test PTT button under the 'Radio' tab in preferences will reliably key the radio (the radio relay audibly trips and the red light on the front panel of the radio illuminates). When I exit the preferences menu and try and operate with FT-8, however, it does not appear I'm actually generating a transmit signal (notwithstanding that the red light on the radio says that it is). My LP-100A watt meter inline to my antenna does not trigger and there is no response via either search and pounce or CQ'ing. I'm guessing I've got a soundcard issue. I've gone through the couple options in Apple's Audio Midi Setup utility and don't see anything there amiss. I can hear the tones being generated by WSJTX, so presume it's not an application issue. Wondering if perhaps it's something within MacOS (I'm running Sierra, 10.12), I pulled out an older 13" MacBook Air running bootcamp w/Windows 7, downloaded the PC version of WSJTX, and tried that. Same results... I can key the radio just fine, but with no apparent outgoing signal. Receive within WSJTX is fine... I can see signals across the selected band, both in the waterfall and within the program's main screen. Any thoughts?