(Image credit: Future / Ian Evenden) The gap between a bedroom and a professional studio has never been narrower, and the laptop sitting on your desk is largely responsible. Today's best machines can run dense sessions in Logic Pro, Ableton Live or Pro Tools with enough headroom left over for a plugin chain that would have buckled hardware costing ten times as much just a few years ago.  Whether you're a bedroom producer sketching out ideas at midnight, an engineer tracking live instruments or a mastering engineer with ears trained to catch the things most people miss, the right laptop changes what's possible. And while you no longer need a hulking, fan-blasting workstation to produce music, you do need a laptop that won't choke when your plugin chain gets ambitious.…