VDrumLib allows you to create custom drum kit libraries for your Roland V-Drum module. The same simple user interface is employed for all of the following Roland V-Drum modules:

TD-6, TD-8, TD-10, TD-10EXP, TD-12, and TD-20

VDrumLib makes it easy to copy, combine, rename, and rearrange your own kits with those from V Expressions Ltd, all without fear of overwriting your personal trigger settings, user patterns, output routings, etc. You can even transfer the libraries to your module with the built-in MIDI transfer software. TD-20 users have the additional ability to transfer kits via the Compact Flash Card slot.

VDrumLib is trialware, so it is FREE for you to try.  If you wish to continue using it beyond the 10-day trial period, a license can be purchased for $19.99 USD.  Purchasing a license entitles you to free updates for life.