Mix to drum kits

Im having problems with volume to play with my beatbuddy in my gigs, Would be great if I could set a better volume between the kits Is possible you add a mixer to help us to mix the drums kits?

Some users are using mixers in their setup: http://mybeatbuddy.com/forum/index.php?threads/my-beatbuddy-pedalboard.807/page-3#post-21029