Hi Karlak,
i'm mot sure about the volume control with anything other than the 3000 evo. When i emailed Parrot, they said that the Connects 2 kit works with the 3100 as well, however you need a couple of other leads as well (cost £18 IIRC). i;ll find the details and stick thm up too.
WRT the 3000 evo, the volume control is via the MFSW, and like one of our other members, once the kit was set up, i have hidthe Parrot conroller button underneath the gearstick gaiter, as you don't need it again - the MFSW will give you access to all the functions.
Personally i like the fact it is hidden. The downside with the 3000 evo is that you fon't seem to get the phonebook sync or GPS functionality of the 3200 - 3400 models, but i'd rather have the MFSW functionality. I guess that is the personal choice you have to make.
If i understand Parrot correctly, the 3200, 3300 or 3400 do not integrate with the MFSW at present via the Connects2 box.
Gerry