I remember trying to shift the range box and the main box to use 7 gears.. It was cool, took a lot of practice, and of course some grinding. but I kept trying even though I was never really needing to do it. I did however use 1st gear low, then shift the range box to high then go through the main box gears, and sometimes I would be in 2nd in the main box and low in the range box, and do the same thing. 2nd lo-2nd Hi, then 3-5.. when I tried to shift 1l-1h then 2l-2h.. I found myself triple clutching.. I was a nut.. No-one trained me on it, I was just self teaching/taught... luckily when I was doing this I had several sand pit's to practice in, and when I messed up, no-one was around.. If I found a twin stick "R" series that I could afford, I would buy it,, just for the heck of it... jojo