Hello Stewarti

Do this:
Connect your device to your computer (or card on which it is installed navigation)
Copy your iGO as it is to the computer (archives)
Prepare everything to re-install / after cleaning the residue from the previous version /. If you have a directory SAVE - remove it!
Change the current file sys.txt in the following way:
Copy your sys.txt file to your computer. Open it in notepad. put to him all the attached section sound.Copy back.
Run the installation again.
Turn off and then on again.
Go to settings and see if there is a voice - for me to be
A'PROPOS - and before that was? What did you do that there?
Let me know how it goes and write how much memory does your equipment?

This is what below, copy the sys.txt:

[sound]
working=1
dev_channels=2
dev_bits=16
dev_smp_rate=48000
dev_buffer_size=9216
csv_voice_enabled=1
ding=1
effect_volume=255
guidance_volume=255
os_muted=0 ; 1 - sound off
os_volume=255
maneuver_chimes=0
media_volume=255
mic_volume=255
mute_os_key=0
queue_length=200
use_os_volume=1
user_volume=255
voice_volume=255

regards wojpen