Mercedes COMAND Online ntg4.5: audio warning

[Hanahoe]

Using an SD card as per Pocket GPS instructions, I have successfully installed the speed camera database onto the COMAND system in a Mercedes ML 2012. I now have on-screen visual warning of a camera detected by the software but no audio warning. I have read in the forums of additionally installing an audio bong in the COMAND NTG4.5 system to sound a warning when a camera is detected. Is it possible to install an audio bong and, if so, how would I do this?
All best wishes
Thom.

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