Re: Roland Modules ( TD-3 TD-4)
I don't own the TD3 so I can't help you there, but I do own the TD4 and I think it's a great little module for the price.
As far as I know the TD4 allows:
1 bass drum
1 hi-hat control pedal
1 snare drum (with 2 zone triggering - so the head and rim trigger different sounds)
1 dual zone hi-hat pad
1 dual zone crash cymbal pad
1 triple zone ride cymbal pad (OR 1 dual zone AND 1 single zone instead)
I hope this helps!