Thanks for your response.
Here is what I gather thus far:
I tried Maya 2019.1 on another machine (an older machine) an it scrubs audio fine.
I reset my preferences on the machine that doesn't give me scrubbing and it still does not work.
I am wonder if there is a conflict somewhere on the machine either software or hardware. Bear in mind, audio playback is fine, but I just can't scrub and hear any audio.
It would help to understand what's the difference Maya uses for audio when scrubbing or just playing back.
This newer machine (the one with the audio scrubbing problem) doesn't have any exotic hardware or software that could interfere with hearing the scrubbing in Maya.
I can hear playback no matter what the evaluation mode is set. DC, Parallel or Serial
Any other thoughts?