If memory servers me correctly AJ I think the XP does allow user arps. It's specs are pretty good. What Roland used as a selling point was the sequencer. At the time 60,000 notes was really good (and still is in my opinion), but the unit had (non-stop loop recording) Big selling point. Plus it really has its power in the ability to load 4 expansion cards. It has 61 semi weighted keys, good synth engine (only one insert though), real time sliders, direct track muting, overall was a really hot synth when it was released.

Squeak