This frame is intended for one-string text information concerning the
audio file in a similar way to the other "T"-frames. The frame body
consists of a description of the string, represented as a terminated
string, followed by the actual string. There may be more than one
"TXXX" frame in each tag, but only one with the same description.
<Header for 'User defined text information frame', ID: "TXXX">
Text encoding $xx
Description <text string according to encoding> $00 (00)
Value <text string according to encoding>
@author Eric Farng
@version $Revision: 1.4 $