The ATV AD5 is an electronic drum module that uses sampled drum sounds. It works with several different brands of pads so you can mix and match what you like. It triggers well and the sounds are good. 

• Works with ATV, Roland, and Yamaha Pads
• Great Dynamics
• Single Trigger Toms
• Works best with ATV pads and cymbals
• Good Quality Sounds
• Simple Interface
• 12 Realistic Acoustic kits with free download after product registration

You can also download more sounds here.