I think the Micro Arranger is virtually the same as the PA50 so anything that can run on the PA50,PA80 etc can run on the Mirco. There are plenty of styles etc out there. After much searching.
Gem Wk4, Solton Ms60, Technics Kn5000, Korg Pa50sd, Yamaha Psr k1, Tyros 4, Korg Pa700