HLX Firmware Version History
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Full Version 2.0.0
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1. Rewrote the main operational code to minimize the number of concurrently 
   running tasks.
2. Added factory default settings to the menu.
3. Added messages that appear over serial for telnet client connection and
   disconnection; also added a telnet client connection message on the clients
   themselves.
4. Removed IR debugging support.
5. Removed extraneous serial output messages.
6. Changed the way the front panel / back panel IR responds with respect to entering
   the zone number. Now once you have entered the zone number using the keypad, you
   are free to hit any source, mute, volume up, and volume down keys in any sequence
   without entering the zone again. Once you have entered one of these commands, typing
   in a new zone number will reset the value. 
7. Added the ability to have additional discreet IR codes to help installers eliminate
   the need for IR control macros. There are now discrete commands for:
   a. Connecting zones to sources
   b. Muting on/off/toggle zones
   c. Volume up/down in a zone
   d. Balance left/right/center in a zone
   e. Bass up/down/flat in a zone
   f. Treble up/down/flat in a zone
   g. Connecting a group to a source
   h. Group volume up/down
   i. Group mute on/off/toggle
8. Switched the default serial baud rate to 9600 baud.
9. Changed the way the Ethernet settings are handled. Now it is possible to change
   any Ethernet settings from telnet or serial without losing the connection; the
   setting changes are saved but are not acted upon until a power cycle or a commit
   command has been issued. Modified the [EQ] command to report if changes have not
   been committed.
10. Added a serial command [EC] which commits Ethernet setting changes. This is so it
    it possible to set a static IP/gateway/network mask over telnet without being
    disconnected. Simply set all the settings as desired, and then issue the commit
    command to cause the changes to occur.
11. Removed unnecessary button pushes from the import/export/firmware update menu
    selections; they are now more streamlined. They also update real-time when the USB
    drive is removed or inserted.
12. Removed the three second delay before automatically rebooting to perform the firmware
    update. Also remove the 'press knob to reboot' messages from the bootloader and made
    it automatically reboot.
13. Added serial command [VG##R##] to ramp a group volume to the designated level.
14. Added serial command [VG##U] to increase a group volume 1 dB from their current
   output levels; for example, if zone 1 and zone 2 are in a group, and zone one is
   set to -10 dB and zone 2 to -20 dB, this command would put them at -9 dB and -19 dB
   respectfully.
15. Added serial command [VG##D] to decrease a group volume (similar to the up command).
16. Added serial command [VMG##] to mute a group.
17. Added serial command [VUMG##] to unmute a group.
18. Added serial command [VMTG##] to toggle muting on a group.