Originally Posted by BrianBrave
Not true grasshopper -
One could purchase this device from bipesauto - it's plug-and-play (and a bit pricey) - but it just bypasses your car radio and feeds the signal from your external device directly to the amp. You have to use your device for controls.
He also make a pretty cool "one-touch" device for your convertable top.
Not sure how the by-pass is made but I'd take a gander that it's way too much money for what's in the box. If this is of interest to people, I will see about making something that would let you even control the volume from the radio but we'll have to see how it works. Something like this I would guestimate could be made for somewhere in the neighborhood of $70-$80.
As for the vario-top "one-touch" device, it's not compatible with our cars and was the reason for me working on the Quick-Touch Top. BTW, the Quick-Touch Top is a 5 wire install and while it doesn't do keyless top operation (don't understand a benefit of it since you have to manually latch/unlatch the top anyways) it does do express up and down of the windows.