I just wanted to add something to this thread. I was was pulling my hair out trying to get SIA to give me playback audio. I wasn't hearing the voice assistant or anything but saw it was recording. I tried changing all kinds of audio settings, as suggested, etc. Turns out, I was able to solve the issue with my particular Newmark USB TT & windows 7 computer by accident. I forgot I had unplugged the USB cable of the TT to try it in another computer. When I turned on my main computer to mess with SIA settings again, the assistants voice was now loud & clear! I plugged in the USB and started playing records strait away! Apparently on my computer, (& maybe other folks), having the USB turntable plugged in before start up muted all sounds. Very strange, but now I'm getting great results by starting up SIA & listening for her voice, THEN plugging in the turntable. Perhaps this may help others with no sound?
Thanks to the support people for listening