I've been working out religiously for about 6 months now and have been watching my diet a lot. I have seen great results so far. I'd like to get some mass but I'm reluctant to really up my calories/gain weight because I always seem to just get a flab around the waist. I was thinking, is it safe to assume that if I keep my current weight stable and continue work outs/proper food, I will gain muscle/lose fat simultaneously? Or do I absolutely have to gain weight to make gains? Also, what would be a good rate to gradually up my weight? How much can muscle/fat ratio change in a month or so and how often could I allow to add 2-3pounds without getting flabby? I'm 6'1'', around 168pounds. Any feedbak would be greatly appreciated.