Type 0 : Terminator

 ┌────┐
 │ 00 │
 └────┛

 This 1-byte sub-block terminates the entire Data Block. It indicates that
 there is no other sub-block after it. CT-VOICE driver terminates voice
 output when this BLKTYPE is encountered.

 This BLKTYPE must be the last block in the voice file.