I played with MS100 as the arranger for a couple of years, even put more ram in for additional styles, before switched to X1, and now SD1. I was happy with it, took me several months after I got the X1 to be able to part with it.
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Tye
SD9, Audya5, Genos, Roland XP60, 2 Yamaha DSR12, 2 Yamaha Sub, 2 Turbosound 2000