We’re currently looking at ways of environmentally sealing the Triggertrap V1 to make it splash-proof, but if you want it to be completely water proof, get yourself a nice DryCase. The Dry-Case is a waterproof case for portable electronics. It has a water-sealed 3.5mm mini jack built in, so you can leave your Triggertrap in the rain for days on end if you want, without causing it to explode in a rain of sparks and hellfire.

The Dry-Case is about $40, but there are cheaper options available as well; have a look around, and you'll find loads of various options.