     7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
00 | Side-tone enable              | Preamble duration             | Tone duration                 | Pause duration                |
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
04 | Dead time                     |
   +---+---+---+---+---+---+---+---+

Where:
  - Preamble duration: multiples of 10ms: 0=0ms, ..., 40=400ms (default), ..., 100=1000ms.
  - Tone/pause duration: multiples of 10ms: 0=30ms (default), 1=40ms, ..., 187=1900ms.
  - Dead time: multiples of 200ms: 0=0.2s, 1=0.4, ..., 10=2.2s, ..., 164=33.0s.
