Do a forum search for "mts sound" (without the " " marks)
Discussed many times
Thank you John, I'm searching now.
Got a few seconds more now...
Some cameras allow you to copy individual MTS files to your hard drive, like my Canon Vixia, and each file is self-contained
Other cameras put "metadata" in the folder structure... so you must copy the entire folder to your hard drive for everything to work... or use the software that came with the camera to do the file transfer
Actually, you can save yourself a lot of effort by making sure your project is set up for your camcorder and then using the program's Get Media/Video Importer tool.
What model of camcorder do you have and how is your Premiere Elements project set up?