Not quite..
EZDrummer and DFH are similar products. They perform the same function, and that is to map realistic drum samples to the MIDI recording. You don't need DFH if you don't want metal sounds, because EZDrummer provides a rock kit that is suitable for most purposes. It lets you choose different snare, kick, tom, hi hat and cymbal types so you can customize the sound, and it has its own mixer to let you adjust the level of the drums and assign them to outputs.
BUT.
EZDrummer does not RECORD the performance. You need a recording program like Sonar, Cubase, Logic, or any other that supports MIDI recording as well as VST instruments. Some programs, like Adobe Audition, do not meet these requirements.
So you need:
1. EZDrummer (It's a VST Instrument plugin)
2. Host recording software to record the drums and then add
the EZDrummer plugin. After you've added the plugin, you can assign the different drums to their own outputs/tracks, where they can then be mixed just like a real mic'd kit. You can even easily edit your performance via the MIDI editor. There are tools that fix timing problems (Quantization), change the velocity of the hits, etc.
So having these 2 things, you hook up the MIDI OUT of your Rolands, to the MIDI IN on your PC, choose a MIDI track in your recording software, and set the input device of the MIDI track, to whatever device is plugged into the Rolands.. it could be the name of your soundcard for instance..
Arm the track for recording, and you're set. It is probably a good idea as well to match the tempo of your recording session to the tempo of what you're playing on the Rolands. You can always monitor through the PC with a metronome enabled in your software, to ensure it will be easy to edit afterwards.