WAVREAD which read single datas

Reading sound data into single (4-Bytes) array.

Usual WAVREAD saves data from a file into 8-Bytes array (each element take 8 Bytes of memory space), however the Standard of WAV sound file format supposes maximum 4 Bytes for each data sample.
It becomes important if you must read long-time sound files (e.g. 5 or 6 hours sound record). It will save about 50% of memory space (and may take 8-10 GB instead 20-22 GB).
You may replace original WAVREAD function (it is the same) or rename this.