i found this in an old post about working in double time. i gave my best explanation of why and how to work in double time. hope it helps. each one teach one. pce.
you def are better off making your beat in double time. so 70bpm would be 140bpm. you also have to understand that when working in double time, your quantize is doubled too. so 1/8 would be 1/16, 1/16 would be 1/32, 1/32 would be 1/64, etc... also, an 8 bar sequence would really be 4 bars, because you are working in double time. once you understand all these factors it will start to make sense to you. cats used double time on the mpc's to get that extra bounce and faster rolls, since the older mpc's only went up to 1/32, but in double you get up to 1/64.
working in the mpc, work in double time. put your 808 snare on 16 levels and play around with the quantize setting and note repeat button. start the roll on 1/8, then try 1/16, then maybe 1/8t. experiment with it to your taste. here's a video of a cat doing it on the mpc 4000, so you can see what i'm talking about. the mpc 4000 is the king of the mpc's for those rolls. i think the 4000 goes up to 1/64 quantize, so you get that 1/128 in double time, like a machine gun. more like newer cats like lex luger.
RAWBEATZZ MAKINIG TRACK ON MPC4000
doing it in software like FL Studio, Ableton, Reason, etc... apply the same concepts. it's even easier with software, because you can get crazy with the quantize/grid settings. also you apply panning effects, delays, etc... to get crazy rolls going on. also, play with velocity settings. here's a video of a cat showing you how to do the rolls in FL Studio. FL Studio is even easier than other programs. in its piano roll it has a midi note chopper tool. you'll see it in this video. that's how Lex Luger does his snare and hat rolls all day.
Snare Roll in FL Studio
Hope that helps. I've been messing around with it too on my MPC 60, MPC 2500SE and Ableton Live. It def takes practice and experimenting to get it good and come up with your own spin on it.
I think Drumma Boy is one of the best and he's using the MPC 4000. I also respect new cats like Lex Luger & Jahlil Beats. Creative drum programming, when done right, gives the beat a good vibe and keeps it moving.