The Apple Mac operating system generates hidden files when the data in 
this folder is copied/downloaded.  This is an OS compatibility issue.

These hidden files cause an Acousonderead.m error in MatLab, and must be
removed.


To remove these files, open a terminal window (Go->Applications->Utilities->Terminal)
and change directory to the folder where the data has been downloaded.

Remove the hidden files, "rm ._*"

The Acousonderead.m function should now perform as advertised.