Actually what you want in an arranger is Logic X's drummer app..



High quallity, with all possible features except seperate effects for each drum sound.. its incredible intuitive and an awesome tool to play around with.


I also like Korg Pa4x's drums... each drumkit has 8 sepperate regions of sounds... you can easilly edit the main settings of these parts.. and even add up to 4 insert effects to the main regions of a drumset... think of regions like bassdrum, hihats, clapps etc etc..


I also agree with Bill that technollogy like round robbin or small variations in timing are essential to make drums sound much much more vibrant and alive...