Thanks, it works with those two files. However there are two issues.
The first is that the "back" and "add waypoint" commands are recognized. The "go" command isn't recognized no matter what I try. I'm still looking into this.
The second is a cosmetic issue. The VR button is simply a black button with no icon. Is there a way to add something there ?

Also, for those that have already installed the vocalizerEX or EX2 voice synthesizers in android, the tts_nua_ve1 inside igo is not needed at all.