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I've got an old (but very reliable) Roland TD12 module. I'm using an A/E Zildjian hi hat, so I no longer need the two hi-hat triggers (trigger H6 and HH CNTL). I've been trying to get an existing pad on my kit to play drum sounds using the H6 trigger. I've gone into "Triggers" and revised it from a HH to a PD85 pad. I've gone into "Instruments" and changed the sound to a tom. No sound results. I've interacted in the Vdrums forum, gotten some advice, and still no sound. One suggestion was to buy an eDRUMin device. So here are the questions: If I get one, and midi it into the TD12 as suggested:

1) Is it that easy? Does the TD12 automatically "see" the new pads (assume 2) connected to the eDRUMin device?
2) I assume I would then follow the same steps I always have in terms of assigning sounds to these 2 pads, correct?
3) When does the need to be a Computer Scientist come into play? (there's always a hitch).

Any help would be greatly appreciated.

AN eDRUMin will give you 4 stereo inputs, plus another pedal input.

It's pretty much plug and play. Myself, I used a MIDI cable from the eDRUMin to my Yamaha module, and it worked right away.
In your module, if it is not already turned on, you might have to find the menu page that turns on/off the MIDI in.

After that, you can use the Drum Map window on the eDRUMin app (yes, you will need either a computer or iPad)to choose which sound you want and calibrate the pad.
The eDRUMin does not need to always be connected to the computer or iPad, only for the initial setup.
But it will need power if you are not using the USB.

I think it's pretty straight forward. Connect the eDRUMin to your computer via USB and TD-12 via MIDI cable. Use the eDRUMin software to set things up. After you have everything setup, you can ditch the USB, but then you'll need to power the eDRUMin with a 9v adapter.

As Perceval metions, you might need to adjust settings on the TD-12. It should be somewhere in the TD-12 manual.

This probably has some relavant info:
http://www.v-drumtips.com/adding-more-pads/

Rob, Perceval, thank you both very much for taking the time to explain. Placed the order just now and we'll see how it goes. Thanks again.

Me, I suggest to use the midi out channel 11 form eDRUMin, it let you access the "percussion set" of the TD-12.
If you use the channel 10 to trigger a snare drum for exemple, the snare input of the TD-12 and the snare input of the eDRUMin will share the same sound.

And it's what is explained in the link pointed by Rob... I should have read it before to post...

Maybe I can at least add that cymbal choke don't work on the percussion set, neither positional sensing. It can be a bit frustrating as we can't really understand why Roland hasn't implement it. Not totally sure for the TD-30 (I have one, I can try if needed), but sure for the Td-12 (should be the same for the TD-20).
So the percussion set is great for tom or effect like cowbell...
You can still access choke function and the positional sensing via channel 10, but then you loose the correpsonding inputs of the TD-12

I just don't understand Roland on this.
Plus, in the newer modules, the percussion set is totally gone.

One reason I like the Yamaha modules.
All the sounds are available from channel 10. All. Including cow bells, congas, whistles, claps, etc....