If you are talking for Hip Hop I would definitely steer toward a workstation versus an arranger.

I would think you would want arps & Karma...

But the Korg PA4X is a great songwriting tool. You may be able to find your niche with it like I have. The sequencer is fully capable to get a complete production down with precise edits. Hip hop would need that.

I posted demos of what the board can do recently here if you are a songwriter. IMO it is a great songwriting tool as well as live performer...

It is the ultimate sidekick for me
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Steve A http://www.stevealtonian.com
Korg Pa4x 76...TASCAM DP24 & DP24 SD. Studio One 6 Professional with a FADER PORT 16. 1969 Yamaha FG-300 Yamaha Red Label Nippon Gakki. Breedlove American CME 25. Neumann TLM-49