Hi Steve,
I got my husband to listen on the headphones and he hears it too. So either we are getting artifacts here - which it could be because it takes a long time to load - or something else is going on. We use ATH-M40fs phones.

Just curious, did you triple track your vocal with the main in the center and one on each side? It sounds like it could be the left or right double coming up in too much in volume in different spots at different times. Maybe that could give the vox a moving or swishing sound. I don't know.

It's not constant throughout the whole song. It's there at the beginning goes away comes back.....

If nobody hears it but us not a big deal.

I am glad he heard it too so I know I'm not hearing things. LOL.