I do not remember the this fact. But there are two model of Nuvi 3790 - original and predecessor (prototype) of 3490. Please check in Nuvi info the version of GPS module if it is different like x.xx vs. x.xx.xx it is mean what on the one of model is no program access to manage sound mixer on hardware.
P.S. I will check on original Nuvi 3790 then go to smoking on car parking.
Ups! Pleasant neighbor is never locking door of his car! No mixer is on his original 3790t with x.xx GPS module...
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