Best Set-up to play Dual Shock 7-key on IIDX?

[CJ.SFAD]

I was wondering what is the best set up to play IIDX on the regular Dual Shock 2, since its too easy to play 5 key. Any help would be greatly appreciated.
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[TiVotj]

I'd say that if you're into IIDX enough for 5-Key on dual shock to be too easy, it's time to get a real IIDX controller.

[DJ_HelloKT]

Two words: You don't. Believe me, I tried. Besides, half the fun in the Bemani games are in the wacky peripherals anyway, right? ^-^
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See You Space Cowboy...