Voice macros with SmartSDR for Mac

I do not often use a microphone but did so today, working a few in CQWW SSB. I used a USB mic connected to a Mac mini and "remote" via LAN to the 6600 . All works well with good audio reports from the Blue Yeti mic . I used the same mic to record a few voice macros , they sound fine when played back on the Mac. However, when I execute the voice macros, there is hardly any RF evident on the RF Power meter . I assumed that perhaps I need to configure audio paths , mic gain, etc, but nothing I changed substantially altered the RF power being sent. The SmartSDR for Mac manual does not mention any special audio routing is needed , so I assume a "Mac" setting on the TX panel would be suffice. That however, did not lead to any success. The RF power meter gets to about 5 watts on peaks. I tried with DAX on and I also played around with the "enable DAX streaming" in the DAX settings, also the three different possible input device settings for the audio . All to no avail. So, I must be missing something simple/obvious. Ideas ?

Andy K3UK