I have now Tested EasyVHS to DVD for Mac version 2.0.1 with 2 different operating systems and here are the results:
Running Mac OS 10.9.5 on a late 2010 MacBook Air, both video AND audio are captured as expected. Using a 2014 27 in. iMac running the latest iteration of Yosemite, OS 10.10.2, I can capture video but no audio. I conclude something must be different in the way the 2 operating system versions handle the audio signal.