Try some distortion and/or saturation. EQ how you want. Ohh, and use diferent hits of that same snare, so it can appear like a real drummer is drumming instead of the same snare hitting everytime.
Real drum roll sample don't sound right? If you have an o.k recorder then try this, play the drum loop through some speakers with good low and mid quality, and record the loop at a good distants from the speakers. It will give your drum rolls that "in the background" effect if you recording them correctly. Can't use a bullshit recorder with bullshit mics though. Blend that in your multitrack with the original "to taste". There you have it, a nice drum roll sitting nicely in the background but still present.
And got dammit, don't none of you bastards come in hear quoting me with some bullshit either, got dammit!