To clarify Boos statement:
The Backing sequencer in the Korgs works different from other brands. In truth, you are only "triggering" a note (or notes) to send to the sequencer, not the whole arranger, so polyphony is less of an issue. Also size of files.
The backing sequencer allows you to still make fill ins and adjustments after you record the song. No one else works like this to my knowledge. The full 16 track sequencer is also present in the Korgs, but they work like a conventional unit should....like all the rest.
For laying down simple arrangements, and adding a few parts over top later - the Backing sequencer is very easy, but it's not as specific as a full sequence, because you are using generic patterns as the base tracks.
Bottom line: If you like the styles....you'll love the sequences you make, and you don't need to be a drummer to program the rhythm parts.
Even a bricklayer can do it.
(atta boy Boo!)