I found the problem with the track that some were hearing.
The volume level of the track was too loud and it became worse when uploaded and processed by sound cloud.

So I uploaded and new version which is toned down and the clipping crackle is gone (to my ears).

How did this happen????
Super Rookie mistake.

I had saved off all 4 tracks we are working on now in .wav format and the output meter was at about -6dB to -4dB.

so they are a bit quieter.

Then I made an audio CD from the .wav files. There was a button that said "Normalize all tracks"
So I said OK.

Later I ripped those songs off of the CD in .wav format and uploaded them to soundcloud.
and they are too hot!