Are the levels ok if you use just the DM10 module? If so, maybe check your default levels in the Mapping menu, see if each instrument is set too low. If they're ok, from one of the kit screens, go to the Instruments screen (I forget if that's the actual name, but it's the next over from the screen that shows you the drum kit choices) and see if the individual instruments are low.. and by the way, that's where you can adjust the cymbals.. on each main kit screen (the main Adpak screens) you can adjust the kick, snare and hi-hat easily on the fly but not the rest of the instruments..mind you, maybe overhead will bring up the cymbals all together).
Lastly, if all volume and sensitivity levels are up at normal ranges, is it the output of the mix that's low? I mean, when I use AD2, I'm going through my audio interface and so I have to make sure I'm dialed in loud enough there plus the computer's volume is up enough.