checkwavs checks whether .wav files can be read by subsequent functions.
Usage
checkwavs()
Arguments
Value
If all .wav files are ok, returns message "All files are ok!".
Otherwise returns "These file(s) cannot be read" message with names of the
corrupted .wav files.
Details
This function has no associated arguments, although the user must
set the working directory where they wish to check .wav files beforehand.