GUpdateMod V1.10

This program can extracts and replace WAV sounds from GUPDATE.GCD. Among these wav 
sounds, we find the picture click, the camera in sight dong-dong, the speed alert, 
etc... You can replace these sounds by new ones. 

Credits: Thanks to neadrenalin for his insights on the GUPDATE.GCD structure.

Latest version:
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I made a wiki page at turboccc.wikispaces.com
You will find all my tools there anbd links to popular GPS site when I can be reached.

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MAKE A BACKUP OF ALL YOUR GPS files before you use GUpdateMod.

*** Use this program at your own risk ***

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How-to:
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1- Copy GUPDATE.GCD from your gps /Garmin directory to your computer.

2- Start GUpdateMod and browse for this GUPDATE.GCD file you just copied.

3- You should see some Wave buttons. 6 for the nuvi 760.

4- You can click the Info button on the left to see the WAV information. You can also
   click "Play" to hear it. 

5- click on the "Save wave to disk" to backup the current sounds.

6- click the "..." to replace the current "Wave x" sound with a new WAV. The new sound
   must have a size equal or smaller than the original one. It must also have
   similar characteristics: 1 channel mono, 16 bits per sampple, ... The sampling rate 
   can be different.

7- Once selected, you can click the info button to the right to see the sound info.
   Make sure it matches what is said in 6-. You can also play the sound by clicking play.

8- Leave the "Replace with:" field empty to keep the current sound untouched.

9- Browse to save the new GUPDATE.GCD file. DONT'T erase your original. You should
   always start this program with the original GUPDATE.GCD. Instead, write it to a
   different directory, but keep the same name.

10- Now, you need to force your gps to update. For now, I only know this way. Let's say 
    you just modified the GUPDATE.GCD for version 3.00. Force an update to version 3.10
    using the proper update method. Reboot the GPS and let it take the update. Then,
    copy in the /garmin directory the new GUPDATE.GCD file you just modified and reboot
    the gps. It will tell you that the firmware version is smaller than the original.
    If you proceeed, the gps will reset your current settings. Say "yes". You will only
    lose your GPS settings, but not your POI and not your Favorites. Once done, 
    your can try the new sounds

Unexpected problems: 
====================

    - the gps says the bew GUPDATE.GCD is corrupted. Something went wrong. Copy back the
      original GUPDATE.GCD or simply delete it and use the web updater.
 
Troubleshooting:
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See the forums listed at turboccc.wikispaces.com


History:
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v1.10 - Added a tab to edit the legal warning at power-up. You can edit it only after
        opening an original GUPDATE.GCD. Otherwise you cannot if the file was alreay 
        modified.

V1.02 - no changes. Only updated readme and Help->About for latest version.

V1.01 - better handling of block boundaries and data block identifier. Not 100% perfect
        but good enough for now. 
        Also corrected audio extraction problem. Extract them again with this version.

V1.00 - First version tested on the Nuvi 760 version 3.00
        This version creates corrupted GCD on wave 1 & 6. OK for 2-5.

