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West coast rhythm machine you say? I highly recommend something that can do Euclidian rhythms and logic like Pamela New Workout or VPME Euclidian Circles! For percussion modules, Noise Engineering BIA is a must as it can do a lot of stuff if you modulate it. I also love Plaits. Here is my compact techno dance machine as an example:

I use 4 percussion modules and Eloquencer with WMD 4TTEN and Praga 4 channel CV mixer that has VCAs built in. Works great.
Plus Eloquencer lets me sequence random, pendulum, 8 channels.