Hello @drmommasays and welcome to the community! Thanks for making your first post in here.
I read this a couple of times and think there’s a “zoom” confusion here @markdenholm. I was also thinking about the Zoom portable recorders but I think @drmommasays you are using the zoom.us online recording service to record. Is this correct?
I’ve not used it myself but, from what I hear, the audio quality is really not that great. This would explain the underwater/tunnel sounds. I think @Izabela may have something more to say about Zoom as she works with quite a few clients that also use it.
My suggestion would be, if a video recording is not important, to look at a different service provider that places audio quality as a priority.
I’ve been using Zencastr (audio only) recently to record and it’s really good. It’ll record both sides of the call in high quality and then mix them together afterwards in the cloud.
I’ve also heard many good things said about SquadCast but not tried them myself yet. They also support video recording so that may be a good option to consider.