The user could possibly have a hot computer mic that is re-recording. Especially important with use of laptop, all of which have a built in mic and most of which default to it as the selection.

Have them check the Record Properties of the sound device, and if the MIC is selected and on, turn it off and try making the file again.

Did not hear anything amiss in all 12 of those raw realtrack files, but may be mentally damaged from having to listen to all that lone fiddle...


--Mac