Block type - 2 SUBSEQUENT VOICE BLOCK.

This type of sub-block is a continuation of the voice data from the
last sub-block of data which is BLKTYPE 1.

The length of voice data is BLKLEN.

        ┌──────┬──────┬────────┬──────┬─ ─ ─ ─ ─ ─ ┐
        │  02  │      │ BLKLEN │      │ VOICE DATA │
        └──────┴──────┴────────┴──────┴─ ─ ─ ─ ─ ─ ┛