Typical Init Sequence:

- 1) Request current tuner state (signal/static and frequency). 
20      29.562  80 06 78 03 09 04 16 00 R       06 03 00 F5 20 00
- 2) Inform the tuner to start (unmute?)
21      29.562  80 06 7A 03 09 04 CA 00 R       06 03 00 F5 20 00
22      29.562  80 06 01 03 09 04 CA 00 R       06 03 01 F5 20 00
- 3) Set the tuner to the current value.
24      29.594  80 06 79 03 09 04 CA 00 R       06 03 01 F5 20 00
25      29.594  80 06 20 03 09 04 CA 00 R       06 03 01 F5 20 00
26      29.594  80 06 00 03 09 04 CA 00 R       06 03 01 F5 20 00
Tuner Command --------^^          ||
Command in Progress --------------^^

Typical Set the Tuner Sequence
- 1) Request current tuner state (signal/static and frequency).  Why twice?
32      12.369  80 06 78 03 09 04 16 00 R       06 03 00 F8 23 70
33      12.371  80 06 78 03 09 04 16 00 R       06 03 00 F8 23 70
- 2) Notify tuner there's a new value coming
34      12.372  80 06 79 03 09 04 CA 00 R       06 03 00 F8 23 70
- 3) Set high byte of new frequency
35      12.373  80 06 23 03 09 04 CA 00 R       06 03 00 F8 23 70
- 4) Set low byte of new frequency
36      12.374  80 06 68 03 09 04 CA 00 R       06 03 01 F8 23 68

Scan Up is just a series of "Set the Tuner" sequences, incrementing the
frequency while checking for signal vs static.

Typical 6-byte return:
                     06 03 00 F5 21 38
Command State --------------^ || || ||
Tuner state ------------------^| || ||
Preset? (maybe part of freq)---^ || ||
Frequency value -----------------^^ ^^

Command State   :  0 - OK, 1 - unfinished command
Tuner State     :  F - static/no channel, 7 - tuned channel
Mystery value   :  Values found 1,2,5,6,8,C perhaps 0-F?
   How is this value indicated (set?), or what does it mean?
Frequency Value : The frequency goes from 77.00 MHz to 108.00 Mhz in 0.05 MHz
         increments, equivalent to  a value of 4 in the least byte (00, 
         04, 08, 0c, 10 ...).  77.00 Mhz = 0x1b68, 108.00 MHz = 2518.  The
         tuner may go beyond these frequencies.

Tuner Commands:
   Each command returns six bytes (except to turn radio off).

0x78 - Retrieve frequency value/tuner state

0x7A - Followed by:
     -- 0x01 - Turn radio on/initialize tuner?
     -- 0x78 - Retrieve frequency value/tuner state
     -- 0x79 - Start set frequency value sequence

0x79 - Start set frequency value sequence, followed by:
     -- 0xXX - high byte value
     -- 0xXX - low byte value
        See Frequency Value noted above.

0x7A - Followed by:
     -- 0x00
     -- 0x02 - Turn radio off
   Returns 18 bytes
     10 03 46 00 4D 00 20 00 4D 00 6F 00 75 00 73 00 65 00
      .  .  F  .  M  .     .  M  .  o  .  u  .  s  .  e  .