by jtrosky » Mon Nov 23, 2015 11:23 am
My understanding of this (which could be wrong) is that you cannot change this from within iGo - it's built into the hardware design.
I once owned a Chinese head-unit that did the same thing (completely cut out the music while iGo instructions were given) - like you, I hated it - was really annoying.
I then upgraded to a "name brand" head-unit (Rosen DS-GM1010-P11) and it only lowers the volume of the music. What I've learned from the Rosen is that the GPS function is *completely* separate from the rest of the unit functions - I believe that it's actually two completely separate operating systems in the unit (whether or not they are the same operating system, I don't know). My understanding is that the hardware is what decides what to do with the music when a GPS instruction is given - I don't think that there is anyway that you can control or configure this behaviour.
Again, this is at least how it is on the Rosen unit - I can't say for sure about other units, but I suspect they are a similar design. Then again, maybe the Rosen unit is different from the Chinese units - it also has completely separate, independent volume levels for the GPS function and all other functions in the radio itself (nothing to do with iGo volume levels).
I've disassembled my Rosen unit and there is a completely separate "module" for the GPS - everything (OS, RAM, CPU, etc) for the GPS function is embedded on that "module" and is completely separate from the rest of the unit. I was kind of surprised - I assumed that it was all one big Windows-CE OS for the radio functions and the GPS functions, but that doesn't appear to be the case - even if I boot into the GPS Windows-CE OS, I cannot see anything non-GPS related (no way to see any files for any of the other radio functions).